Friday, June 22, 2012

How About A Fecal Transplant?

Yes, you read correctly.  A fecal transplant.  "Fecal" as in "poop."  "Transplant" as in "from one person to another."

This new medical procedure makes the idea of using leeches, maggots, and flesh-nibbling fish seem appetizingly appealing by comparison.  I recently learned about it from a couple of New York Times science articles by Carl Zimmer and Gina Kolata, and it was so interesting I did some followup investigating of my own. The transplant is one promising development in the treatment of all kinds of health problems that has emerged from the field of medical ecology, a branch of microbiology which studies the complex interactions between health and a person's microbiota (or microbiome), the collection of 100 trillion microbes that live on and in each human body.

The two to five pounds of complex microbial communities that inhabit our bodies are apparently essential to not just our health but to our very existence.  Without them we would be unable to digest food, synthesize certain vitamins, and fight off many infectious diseases.  While it is certainly true that quite a few bacteria are harmful to us, many more are beneficial to the point that we can't live without them.  Our microbiome is as essential to us as our heart or our brain.

A microbiome is a true ecosystem in the sense that it involves a complex balance among the many different species of bacteria, viruses and fungi that comprise it.  In fact, one difficulty in studying these organisms has been that they are so adapted to living surrounded by other microbes and are so dependent on their host body that many can't be isolated and grown in the lab, and even if they do survive outside of the body they often behave differently than in their natural environment. However, a recent five-year federally funded research program has begun to give a clearer picture of our microbial communities and their impact on our health by using DNA analysis that doesn't require laboratory cultures. Called the Human Microbiome Project, the study involves 200 scientists at 80 institutions who have sequenced the genetic material of bacteria taken from nearly 250 healthy people, an immense effort that has led to some surprising findings.

For one thing, the researchers discovered more strains than they had ever imagined — as many as a thousand bacterial strains on each person. And each person’s collection of microbes was different from the next person’s, a kind of microbial fingerprint that uniquely identifies each individual.  Also surprising was that there were genetic signatures of disease-causing bacteria and viruses lurking in the microbiome of every one of these healthy individuals.  Instead of making people ill, or even infectious, the disease-causing microbes were simply living peacefully among their neighbors, held in check by the complex interactions of the microbiome community.

Another finding is that a person's microbiome changes throughout life in response to environmental and biological influences.  This process begins at birth, when certain key bacteria are transferred from mother to child during delivery and afterward during nursing. In pregnancy the relative concentrations of certain bacteria change in a women's birth canal in response to hormonal shifts.  One species of bacteria that is normally rare but becomes dominant is lactobacillus johnsonii. It is usually found in the gut, where it produces enzymes that digest milk. It’s an odd species to find proliferating in the vagina, to say the least. Dr. Aagaard-Tillery, one of the scientists who made this discovery, speculates that during delivery a baby will be coated by lactobacillus johnsonii and ingest some of it, an inoculation that prepares the infant to digest breast milk. The milk, it turns out, contains some 600 species of beneficial bacteria and also certain sugars that the baby can't digest but which nourish the bacteria. It seems the mother is not only feeding the child but also the child's bacteria and thereby promoting the development of the child's microbiome.

Our cultural attitude toward microbes is decidedly negative and non-selective:  "The only good microbe is a dead microbe."  However, the more we learn about the microbiome the clearer it becomes that this is not really justified and may be very harmful to us in the end.  For example, the use of broad-spectrum antibiotics to treat infections, while effective in the short run, wipes out not only the bad bacteria but also many of the the ones that are necessary to restore and maintain health.  We have generally assumed that the microbiome would return to normal on its own, but scientists are now realizing that assumption isn't justified -- it would be like assuming that lettuce and tomatoes would spontaneously return after spraying the whole garden with herbicide to kill the weeds.  In fact, there appear to be certain strains of harmful bacteria that thrive in disrupted or diminished microbiomes following broad-spectrum antibiotic treatments, like the antibiotic-resistant Clostridium difficile.  Re-establishing a healthy microbiome is very difficult in these circumstances.

Enter the fecal transplant.

According to Lita Proctor, program director for the Human Microbiome Project, "Half of your stool is not leftover food. It is microbial biomass.”  Assuming the donor is healthy, this means stool contains the complex collection of microbes needed to restart a depleted microbiome in another person.  And it seems to work.  Initial studies using fecal suppositories to treat Clostridium difficile infections have been very promising, and larger clinical trials are underway.  Fecal transplants are also being studied as a way to treat obesity by transplanting fecal samples from lean donors to obese patients. Researchers at the Academic Medical Center in Amsterdam are running a clinical trial to see if fecal transplants can help treat obesity. They have recruited 45 obese men; some are getting transplants from their own stool, while others get transplants from lean donors. The scientists are finding that the transplants from lean donors are changing how the obese subjects metabolize sugar.

Efforts are also underway to isolate the bacteria from the poop, to remove the "ick" factor, as researcher Dr. Alexander Khoruts puts it.  He would eventually like to develop probiotic pills that contain just a few key species required to build the intestinal ecosystem  -- Poop Pills, so to speak.

I certainly learned a lot from researching this topic, and the information has changed my outlook about who and what I am. For one thing, I realize how wrong my belief is that I am separate and independent from my environment.  "I" am composed of trillions of other organisms without which I could not exist.  They are as much "me" as any other part of my body.  As Dr. Barnett Kramer of the National Cancer Institute has said,  "humans in some sense are made mostly of microbes. From the standpoint of our microbiome, we may just serve as packaging.”

Certainly a humbling thought.





Friday, June 8, 2012

Disney Dreams

Walt Disney opened his California theme park in 1955 with these words: "To all who come to this happy place, welcome."

"This happy place" quickly morphed into the slogan of the park that persists to this day -- "The Happiest Place on Earth."  The recognizability of the phase as referring to Disneyland and now to other Disney parks certainly attests to its success as a marketing logo, but also to the fact that several generations of visitors have agreed with the sentiment it expresses.

Although Walt clearly wanted to make people happy, there was quite a bit more to it than that.  At the 1955 opening ceremony he went on to say,
 "Disneyland is your land. Here age relives fond memories of the past...and here youth may savor the challenge and promise of the future. Disneyland is dedicated to the ideals, the dreams and the hard facts that have created America...with the hope that it will be a source of joy and inspiration to all the world."
His own dream was embodied in his plans for Disney World in Florida,  a project that went way beyond anything he had accomplished at Disneyland.  As I mentioned in my last blog, Disney World was opened in 1971 but sadly Disney died of lung cancer before it was completed. The official motto of WDW became "Where Dreams Come True," perhaps a reference not only to the dreams of visitors but also to Walt's own. At the grand opening Walt's brother Roy alluded to this:
"Walt Disney World is a tribute to the philosophy and life of Walter Elias Disney ... and to the talents, the dedication, and the loyalty of the entire Disney organization that made Walt Disney's dream come true. May Walt Disney World bring joy and inspiration and new knowledge to all who come to this happy place ... a Magic Kingdom where the young at heart of all ages can laugh and play and learn ... together."
And Julie Andrews, host of the televised ceremonies, made the connection very clear, referring to the park as "...a joyful land built by an inspired dreamer for other dreamers and dreams still to come."

It is hard to find fault with these sentiments.  They seem particularly uplifting in this time of economic, political, and social malaise.  After the deaths of Walt and Roy, it fell to the corporate structure they created to carry on the ideals they had espoused in these dedication speeches. For the most part I think the Disney brothers would approve of the changes in the parks and the numerous other new projects and developments that have taken place in their name over the years.

The many times I have visited the parks (almost always WDW) I have enjoyed myself thoroughly.  However, my last stay at WDW produced some nagging qualms that I have been struggling to deal with.  In my last blog I explored one of them, the presence of thousands of school-age children before the end of the school year who did not seem to be there to "...savor the challenge and promise of the future" nor to appreciate "new knowledge."  But they were certainly managing to "...laugh and play"  (well, when they weren't on their cell phones).

Another qualm has to do with the message that seems to underlie the current use of the slogans mentioned above.  It was about five years since I was at WDW, and I'm not sure whether it is me who has changed or whether it is the way the taglines are being used, but during my most recent visit I began to detect a shallowness to the constant emphasis on dreams, wishes, memories and magic -- a shallowness that certainly doesn't do justice to Walt and Roy.  The message, delivered in performances and attractions that were invariably entertaining and thoroughly effective at evoking warm and fuzzy visceral emotional responses, seemed to be that your dreams will always come true if you just wish with all your heart.  Just wish it and it will happen, no matter what you want.

This idea appeared in many venues and was especially evident in the spectacularly well-produced nightly fireworks show called, appropriately enough, Wishes. The show begins with some great fireworks and a few words from the Blue Fairy, who proclaims that when a star is born it has the power to grant a wish.  A song follows ending with the well-known refrain "When you wish upon a star, makes no difference who you are, anything your heart desires will come...to...you."  Jiminy Cricket then directly addresses those who might be skeptical:  "I'll bet a lot of you folks don’t believe that, about a wish coming true, do ya? We'll I didn’t either. Course, I’m just a cricket, but lemme tell you what made me change my mind. You see, the most fantastic, magical things can happen, and it all starts with a wish!"  The evidence is then presented in the form of the wishes-come-true of Tinkerbell, Cinderella, Snow White, Ariel, Peter Pan, Pinocchio, and Aladdin.  Jiminy concludes "You see, its just like I told ya. Wishes can come true, if you believe in them with all your heart."

Well, ok.  But I wonder if a more beneficial lesson might not be drawn from Disney's own life.  His dreams didn't come true just because he wished them to but rather because he worked hard, took great risks, and sacrificed much to overcome many difficulties and obstacles.  He was frequently on the brink of financial disaster;  his creative ideas and plans were often met with skepticism and derision;  a number of his projects were failures, or were abandoned before they were started.  Despite these challenges he persevered when many of us would have given up.  Wishing and dreaming were necessary to his success, but hardly sufficient. 

In my view that's the true legacy of Disney.

Wednesday, May 16, 2012

A Disney Education

My wife and I just spent a week at Walt Disney World Resort in Florida. No, we didn't take kids or grand kids with us -- we don't have any, and besides in our view they would spoil our fun.

We have visited WDW many times since it was opened in 1971, usually every five years or so.  Any more often is an overdose, similar to going to Las Vegas too often.  Both places offer escapist fantasy of the highest order, best enjoyed after a break to re-center and re-ground your sensibilities.

It is important to distinguish between Walt Disney World (WDW) in Florida and Disneyland in California.  Disneyland was Walt's first theme park, a ground-breaking concept that opened in 1955 and almost immediately outgrew its available space.  WDW in contrast consists of a vast tract of 47 square miles in central Florida, with four widely spaced theme parks (Magic Kingdom, Hollywood Studios, EPCOT, and Animal Kingdom),  two water parks, 23 on-site themed resort hotels (excluding eight more that are on-site, but not owned by the Walt Disney Company),  a campground, two spas and physical fitness centers, five golf courses, and other recreational and entertainment venues in an area known as Downtown Disney.  If you stay on site, as we choose to do, you are immersed in the whole Disney experience 24/7.  Mickey and friends are everywhere, including on the soap in your bathroom;  everything is neat and tidy; everyone is polite, friendly, and happy.  As I said, escapist fantasy of the highest order.  Sadly, Walt Disney died at 65 from lung cancer, five years before his dream opened in 1971.  His older brother Roy delayed retirement to oversee the initial development of WDW and then died a few months after the opening. 

Our visit was at the end of April, a time we thought would be less crowded because it was after most school spring breaks and before summer vacations.  We reasoned that most parents are concerned with their children's education and wouldn't take them out of school just to visit a theme park. This is also a time when central Florida weather is still moderate.  Our other visits have been in the fall, around Christmas, and during the summer, and so we were looking forward to our first springtime visit.

We were right about the weather --  most days were clear and the temperature was pleasant.  And the crowds weren't as bad as they can be in the peak summer months.

But we were dead wrong about the numbers of school-age kids.  Besides quite a few families with one or more children there were many, many groups of junior high and high school kids from all parts of the country, apparently on field trips or senior outings.  And there were thousands of teenage girls who were participating in the annual World Championship Cheerleading competitions being held at EPCOT.  When the cheerleaders weren't competing they were roaming the parks in packs of 10 to 20 giggling and jiggling "nubile nymphettes," as I called them. Needless to say, this altered the "Magical" atmosphere considerably.

The presence of so many kids whose schools were still weeks away from summer break raised questions in our minds about the commitment of the kids as students, the educational priorities of their parents, and the values of the sponsoring organizations (maybe including Disney Corp.).  I'm sure there are all kinds of practical justifications for these children to miss school in order to visit WDW;  parents cannot always control the timing of their vacations from work;  it's easier for organizations to schedule venues at WDW during this time of year;  travel arrangements are cheaper and more plentiful now than in the summer.  It is also true that not all "education" takes place in a classroom and indeed there are a number educational aspects to be found in WDW. 

These justifications seem reasonable but I think they may be problematic in several ways.  First, though visiting WDW can be educational in some ways, that is true no matter when it occurs.  On the other hand certain important educational experiences are closely tied to a classroom --  for example, I've never seen anything in WDW that would substitute for a skillful explanation of algebraic expansion or the laboratory experience of working through an analytical chemistry problem.  Second, the absence of large numbers of students poses significant logistical problems for teachers and schools, both in altering the classroom structure that is supportive of learning and in placing additional demands on teachers to help students make up work they have missed. Third, when parents and organizations endorse school absence they convey to young people that education is less important than entertainment and enjoyment.  I'm afraid this is a general trend in our society today, and I don't believe it serves us well in the global community.  As my wife and I have traveled around the world we have seen many developing countries investing heavily in education and  infrastructure. The support for educational institutions and teachers is striking.  Just the opposite seems to be the case in the U.S., as illustrated by recent budget cuts to schools and universities and salary freezes and reductions for teachers.

Maybe I'm making too much of this.  Or maybe I just received my very own Disney Education.

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An additional resource on Disney can be found at http://www.units.muohio.edu/psybersite/disney.  This web site was created by a group of my students as a class project some years ago.

Here are a couple of quotes about Disney you may find interesting:

When Dwight D. Eisenhower was President, called Disney a "genius as a creator of folklore" and said his "sympathetic attitude toward life has helped our children develop a clean and cheerful view of humanity, with all its frailties and possibilities for good."

Prof. William Lyon Phelps of Yale said of Mr. Disney: "He has accomplished something that has defied all the efforts and experiments of the laboratories in zoology and biology. He has given animals souls."

Thursday, April 19, 2012

Bankers' Math -- Part Sept

The first blog in my Bankers' Math series was three years ago and dealt with some of the self-serving manipulations my bank went through when my wife and I refinanced our mortgage.  Since then I've documented several excesses of the financial industry that I've encountered first-hand, and you can find links to these blogs below if you haven't read them.  Caution -- those readers with high blood pressure are advised against exposure to this material.

In this installment of "what-are-the-folks-who brought-us-the-great-recession-up-to-now" we return to mortgage refinancing, an ordeal we have just undergone once more.  We chose to endure this again because we could get a new mortgage rate that is more than a percentage point less than our old rate. Most personal finance experts say a drop of this magnitude is worthwhile -- provided the length of time it takes to recoup the umpteen bank fees and charges is reasonable.

In January we contacted our bank (Bank of Hawaii) and started the process.  Because of my tendency toward obsessiveness when it comes to keeping financial and personal information, we quickly got all the required records together -- tax returns for the last two years, mutual fund and investment statements for all of 2011,  payment statements from our pension funds, birth certificates, life history, retinal scans, DNA samples, diplomas, fingerprints, Kirlian photographs, urine analyses, etc., etc.   We completed the application by the end of January.  After 2 1/2 months BOH finally deemed us worthy of their blessing and we "closed" -- the bank's term for an hour-long session in which you sign several thousand documents, all designed to give the bank every possible legal advantage over you.

Of the many irksome aspects of this process, one stands out.  It occurred when we received the official Loan Approval Notice which said:  "We are pleased to inform you that your application for a mortgage loan on the terms set forth is approved, provided the conditions and terms below outlined are satisfied prior to the expiration date of the loan approval and loan closing."  (In other words, keep jumping through hoops until we tell you to stop.)  Some of the conditions listed were simply not under our control, for example "Lender (my italics) will provide customer with an IRS 4506-T to be signed at closing."  Huh???

But one condition was truly rankling:  "Borrowers must provide proof of liquid assets required for closing."  (The money required for closing had been spelled out in the application and amounted to just a few thousand dollars.)  We puzzled over this because it seemed obvious to us that we had already documented all of our assets, including those that were liquid. But bankers apparently see the world differently than the rest of us....

In our view the documents we provided with the initial application established the following facts that would seem to be relevant to whether we would be able to show up at the closing with enough cash:

  • Our financial records clearly indicated liquid assets five times greater than the value of the loan itself  and dozens of times greater than the estimated closing costs.
  • We had been through this process twice before with BOH and both times we successfully paid the closing costs.
  • For six+ years we'd faithfully made mortgage payments to BOH showing, one would think, that we have enough liquid assets to meet our financial obligations.
  • The appraised value of our house is twice the value of the loan we were asking for, clearly indicating we were not in over our heads.
  • We have no other debts of any kind -- no other obligations competing for our liquid assets.
  • We both have credit scores over 800 -- only obtainable if financial obligations are fully met over a long period of time.
So what did we do?  We printed a screen shot of our Vanguard accounts showing the up-to-the-minute balances and wrote a letter suggesting that this "proved" we had enough money to cover the closing costs. This seemed to mollify the bank and we oozed closer to a closing date.

However, about a week from D-Day we got a message demanding the latest statement of some accounts Karen has with DWS, a mutual fund company.  We had furnished a summary with the initial (now accepted) application, but apparently someone decided that wasn't enough and now they wanted a recent detailed, transaction by transaction statement.  I quickly complied and just for good measure I also sent the latest monthly Vanguard Statement showing transactions for all the rest of our mutual funds, and I even threw in a copy of our 2011 Federal Tax Return that I had just filed.  Again, the bank bean-counters seemed mollified and we continued oozing.

Until four days later.  "Please furnish the most recent monthly statement for your......[wait for it]......Vanguard Accounts(!!!!!!)  Yes, the very same information I had given them four days earlier!

I drew their attention to the fact I had just given them this statement (with great restraint, I might add) and we moved forward.  I never received an apology, an explanation or even an acknowledgment that they might have made a mistake.  But it's clear they weren't really looking at the information we were providing to them.

It's over, and I'm very glad to have it behind us.  But I have to think that if this is how we were treated -- someone with excellent credit and a solid financial status -- then people with even slightly less fortunate circumstances must suffer tremendous insults during this process. 
____________________________________________
Other Blogs in the Bankers' Math Series:
Bankers' Math -- Part Six
Bankers' Math -- Part Cinq
Bankers' Math -- Part Quatre
Bankers' Math -- Part Trois
Bankers' Math -- Part Deux
Bankers' Math -- 29=31=$

Thursday, March 29, 2012

Flying the (Un)Friendly Skies

One of the worst things about traveling is...traveling.  Specifically, air travel. This once-glamorous mode of transportation has now become a stressful, hassle-laden, uncomfortable, and often degrading experience.  My wife and I visit other other places for fun and enrichment, which usually makes up for some of the negatives of getting to our destination.  We have great sympathy for business travelers who endure flying for their jobs and don't have this compensation.

My wife and I fly quite a lot, often to places that are far from home (see my blogs on Bhutan and on the Middle East).  We can't afford Business Class or First Class, so these journeys are in "steerage" unless by some increasingly rare miracle we get a free upgrade. It isn't unusual for the total flying time on these trips to be 15-20 hours, usually but not always broken into two or more segments of 5-10 hours each.  Once we suffer through the cattle-pen atmosphere of checking in, the indignities of going through security, the elbow-fest of getting our share of overhead bin space, and finally shoe-horning ourselves into our seats, the rest of the trip is primarily a matter trying to cope with excruciating boredom and physical discomfort.

At this point I should acknowledge that we have it incredibly easy compared to the days before air travel, and we forget that commercial aviation is a very recent technological marvel.  Someone from the late 1800's would find our complaints trivial in light of the wondrous feat of traveling half-way around the world in a day or two.

But human nature leads us to use a more restrictive basis of comparison, namely how things have changed in the recent past.  Geopolitical events, like 9/11, have led to tightening of airport security. Financial pressures on airlines have led to a host of cost-cutting measures, including reducing the number of flights, cramming more seats in each aircraft, charging for luggage, meals, and on some airlines even for the privilege of reserving a specific seat in advance.  In short, it seems like the situation is getting worse and worse.

The latest round of decline for us involves the recent merger of United Airlines and Continental Airlines.  For years we have been members of United's frequent flyer program primarily because United has offered the best mainland and international connections.  Of course, actually cashing in our award miles has always been a little difficult because we live in Hawai'i -- a popular destination for people to use their miles to visit, making competition for available award seats fierce.  Still, we've managed to take advantage of the program often enough that it has balanced some of the negatives of air travel.

One of the best features of United's program was that if your paid travel in a year totaled 25,000 miles or more you were rewarded with some extra perks (please note -- these must be miles flown, not earned in other ways, like with a credit card):  You could reserve seats in economy with more leg room, check two bags free, and board the plane earlier (thus avoiding some of the slug-fest for overhead storage).  On our marathon journeys these things have made a big difference, particularly having more comfortable seats, and have kept us loyal to United's program.  And given the amount of money required for us to achieve 25,000 miles in a year, these perks seemed a fitting gesture of appreciation from United for our business.

The merger has changed all that -- for the worse, naturally.

A few weeks ago we received notice from United about the new "wonderful" and "exciting" features of the merger, including the merged frequent flyer programs.  Cutting through all the breathless corporate hype revealed new policies that represent a dramatic downgrade of benefits for customers like us at the 25,000 mile level.  The most irksome change is that now reserving seats with more leg room requires 50,000 miles in a year -- double the earlier number and certainly out of reach of the ordinary traveler.  Even many business travelers might have trouble meeting that requirement.  You can, however, pay extra for those seats -- an additional $150-250 per person for trips of the length we usually take.  There is one shred of this perk left -- 24 hours before the flight we can vie for the unsold premium seats with all the other 25k-milers.  Of course, this means that we may not find seats together, or that the available seats will be in those wonderful "middle of the middle" locations.  Spending 15-20 hours in one of those seats is decidedly unappealing, something you might wish only on the CEO who masterminded this new policy.

For us these changes no longer give United an edge compared to other airline frequent flyer programs. The new policies convey that our loyalty and considerable level of spending don't count for as much as they did.  So be it, and we wish United a profitable future. Their profit probably won't be coming as much from us, however, because we will be much more likely to consider alternative carriers.

Wednesday, March 7, 2012

Decision Making in Geezerhood

The waitress returned for the third time, order pad in hand.  "How we doin' here folks?  Are you guys ready to order or would you like another few minutes?"  There was a tone of sweet condescension in her voice, likely the result of her reaction to our grey hair.  I imagine she was thinking: come on geezers, make up your minds!

One of the stereotypes of older people is that they have difficulty making decisions and the decisions they finally come up with are often flawed.  Like most stereotypes, this one has a kernel of truth but also distorts the real picture, and is flat-out wrong in certain cases.  For instance, my wife and I have always taken a long time to order in a restaurant because we share each dish and we are both particular -- so it takes some time to select things we both will like.  Being geezers is irrelevant.

However, there is ample evidence from research on aging that the average performance of older people on many types of decisions is both slower and less optimal than younger people.  This is particularly true when the decision involves remembering, evaluating, and comparing many pieces of information that vary in relevance to making an optimal choice.  The cognitive declines in memory, analytic reasoning, and executive functioning that are common in older adults make these kinds of decisions more difficult and results in sub-optimal choices (Henninger, Madden, and Huettel, 2010).

Financial decision-making is one realm in which the consequences of poor choices can be very important. The cognitive deficits associated with aging have been found to be particularly problematic in this context. For example, a Brookings Institute study comparing age groups on a variety of financial products found that older people wind up paying higher fees, penalties, and interest rates across a wide range of credit transactions, including credit cards, mortgages, and car loans (Agarwal et al., 2007).  Interestingly, the relationship between decision quality appears to be U-shaped, with the most optimal decisions made by those around 50.  One explanation of this curvilinear function is that young people, though they have high cognitive abilities lack experience and background knowledge, whereas older people have a great deal of experience and knowledge but have difficulty applying this because of cognitive deficits.  In middle age there is an optimal trade-off of experience and cognitive functioning.

Another important aspect of financial decision-making involves making choices that require an assessment of risk of loss versus probability of reward.  For example, maintaining an investment portfolio of 100% bonds entails very little risk but provides limited rewards, whereas a portfolio of 100% equities entails much more risk but also may provide significantly greater returns over time.  And of course there is considerable variation in the risk levels of individual stocks and bonds that requires evaluation and comparison of complex information in order to make an optimal choice.

Unfortunately, research evidence concerning the quality of decisions involving risk indicates that geezers tend to make poorer decisions than young people.  Henninger et al.(2010) recently summarized the data succinctly:
...older adults’ real-world decisions involving risk are often of objectively worse quality than those of younger adults, both in laboratory and real-world settings, with an abrupt decrease in decision-making skill observed in individuals over 70 years of age (Korniotis & Kumar, in press). As examples, older adults within that age range earn 3%–5% lower risk-adjusted annual returns (Korniotis & Kumar, in press) and obtain systematically worse outcomes on a wide variety of financial instruments (Agarwal, Driscoll, Gabaix, & Laibson, 2007), even when controlling for confounding factors like income, investment horizon, and desired rate of return... In short, substantial evidence demonstrates that older adults are more likely to make poor-quality financial decisions, often leading to significant negative personal consequences.
In line with the "conservative geezer" stereotype, one source of these sub-optimal decisions might seem to be a general tendency toward risk aversion even when some degree of risk is adaptive. However, the evidence indicates a more complex picture. Though older people do exhibit detrimental risk aversion in some circumstances (Mather, 2006), they also may show the same or even more risk preference as young people in other situations.  For example, if the benefits of an alternative with more risk are emphasized, older adults may weigh them more heavily than young people.  This stems from the general tendency of older people to be more optimistic and positive than younger people, a phenomenon I explored in an earlier blog.  In the financial arena this tendency may lead to poorer choices and susceptibility to scammers (Ross, 2010).

So far the picture looks pretty bleak, but fortunately I can end on a couple of positive notes.  First, recognizing the challenges of geezer decision-making allows the development of ways of presenting information modifying the context of decision making to compensate for declines in cognitive functioning, for example by reducing the memory load in decision tasks and by presenting information in ways that can be more readily related to older adults' greater past experience (Henninger et al., 2010) and that may more clearly balance the positive and negative aspects of risk alternatives (Ross, 2010).

Second, it is clear that there is considerable variability in the quality of decision-making by geezers, to the degree that some older people outperform younger adults.  This variability has been shown to be tied to differences among older people in the degree of cognitive decline -- an important fact because it means that it isn't age per se that leads to poorer decisions but rather it is the degree of specific types of neurological deficit.  And there is abundant evidence that the rate and amount of cognitive decline can be altered by life style choices, with the most dramatic effects coming from continuing physical exercise throughout middle and old age (see my blog Jogging the Memory of a Geezer for a review of this research).

Yet another reason to lace up those walking shoes -- it might keep you solvent!

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Agarwal, S., Driscoll, J., Gabaix, X., & Laibson, D. (2009). The age of reason:  Financial decisions over the life-cycle and implications for regulation.  Brookings Papers on Economic Activity, 2, 51-117.

Henninger, D.E., Madden, D., & Huettel, S.A., (2010). Processing Speed and Memory Mediate Age-Related Differences in Decision Making. Psychology and Aging, 25, No. 2, 262–270.

Mather, M. (2006). A review of decision-making processes: Weighing the risks and benefits of aging. In L. L. Carstensen & C. R. Hartel (Eds.), When I’m 64 (pp. 145–173). Washington, DC: National Academies
Press.

Monday, February 13, 2012

Tons of Fun: Humpbacks in Hawai'i

They're back!

Each winter Hawai'i gets thousands of repeat visitors, many of them of the species Humanica Snowbirdae, giving a much appreciated boost to our economy.  The visitors I look forward to the most, however, don't spend a dime.  They weigh an average of 40 tons and are the size of a bus.  I'm referring to Megaptera Novaeangliae, or Humpback whales, who come here for some of the same reasons as Humanica Snowbirdae;  the warm clear ocean waters, idyllic weather, romantic mating habitats.

However, the Humpbacks differ in several respects from most Snowbirdae.  For one thing Humpbacks give birth here to their 1-ton 12-foot long calves.  The actual moment of birth of a Humpback is still something of a mystery -- no one has been able to document the event itself.  Nor are scientists certain why the whales don't just stay in their home territory of Alaska to give birth rather than swimming 2,000 miles to Hawai'i.  One reason may be that the shallow warm waters around the Hawaiian Islands are a safer nursery for the babies because they can escape predation from Orca whales, who don't often range this far south, but no one knows for sure.

Another difference between Humpbacks and other visitors is that the Humpbacks don't eat during the entire time they are here, whereas Humanica Snowbirdae are noted for their enthusiastic consumptive behavior.  The Humpbacks' diet consists mostly of tiny plankton and krill as well as small fish like mackerel which aren't found in enough abundance in Hawaiian waters to sustain them.  This 2-3 month starvation diet is particularly hard on new mothers, whose fat reserves have to be enough for both them and for their newborn calves to develop strength and stamina for the arduous trip back to Alaska.  Maybe for this reason females are larger than males, one of the few mammals for which this is the case.

Humpbacks seem to have a lot of fun while they are here, like many other visitors do.  But Humpback "fun" can be very dramatic, particularly when they breach, launching themselves almost completely out of the water and landing with an impressive splash visible for miles.  You can imagine the strength it must take to propel 40 tons of blubber straight up out of the water -- and I've seen individuals do this repeatedly for 20-30 times.  They also like to slap their pectoral fins or their tail flukes on the surface making a tremendously loud noise.  Scientists think this behavior is associated with courtship and social dominance, but in their home feeding grounds Humpbacks also use these behaviors to cooperatively round up food.  Whatever the reason, it sure looks like they're having a great time.

One of the most widely known behaviors of Humpbacks is their singing.  But most people aren't aware that (a) only the males sing and (b) nearly all singing takes place just before and during migration and while the whales are here in their breeding grounds.  The strange underwater sounds that sailors heard for centuries weren't identified as coming from Humpbacks until the 1960's, when they began to be studied scientifically.  Here are a few of the recent findings detailed by the conservation organization Whale Trust:
A typical song is ... made up of 5-7 themes that are usually repeated in a sequential order. A song typically lasts 8-15 minutes (although it may range from 5-30 minutes), and then is repeated over and over in a song session that may last several hours... A striking feature of the song is that it gradually changes or evolves over time. Each year, different sounds and arrangements of sounds form to create new phrases or themes. These changes are slowly incorporated into the song, while some older patterns are lost completely...The change in the song display seems to occur in a collective or common way throughout the population. Usually after a period of several years, the song is virtually unrecognizable from the original version. In some cases, however, the song has completely changed in just two years! Despite the constantly changing nature of the song, all singers in a population sing essentially the same version at any one time. In fact, all the singers in the North Pacific (that is, whales in Japan, Hawaii, Mexico and the Philippines) separated by thousands of kilometers sing essentially the same version of a song at any one time...The explanation for the collective change of the song, especially over such vast distances, is currently unknown.
Humpbacks were nearly driven to extinction by relentless hunting during the 1800's and early 1900's.  Hundreds of thousands were slaughtered during this time for their oil, meat, and bones. During the period 1910-1916 more than 60,000 humpbacks were killed just in the southern hemisphere.  The North Pacific population was reduced to just 1,000 animals at the lowest point. They have been protected for about the past 50 years and have made a slight comeback, with the current world-wide population about 6-10 thousand, 50% of whom overwinter in Hawai'i.

Hopefully we can continue to co-exist peacefully with these magnificent gentle giants. They are truly extraordinary sentient beings....and tons of fun.
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Animal Diversity Web (University of Michigan)
Earth Trust: Humpback Whales
National Geographic:  Humpback Whales
Whale Trust:  Humpback Songs