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Sunday, January 12, 2014

Hyperthymesia: People with Extraordinary Autobiographical Memory


Individuals with hyperthymesia can recall almost every day of their lives in near perfect detail, as well as public events that hold some personal significance to them. Those affected describe their memories as uncontrollable associations, when they encounter a date, they "see" a vivid depiction of that day in their heads. Recollection occurs without hesitation or conscious effort.

It is important to draw a distinction between those with hyperthymesia and those with other forms of exceptional memory, who generally use mnemonic or similar rehearsal strategies to memorise long strings of subjective information. Memories recalled by hyperthymestic individuals tend to be personal, autobiographical accounts of both significant and mundane events in their lives. This extensive and highly unusual memory does not derive from the use of mnemonic strategies; it is encoded involuntarily and retrieved automatically. Despite being able to remember the day of the week on which a particular date fell, hyperthymestics are not calendrical calculators like some people with autism or savant syndrome. Rather, hyperthymestic recall tends to be constrained to a person's lifetime and is believed to be an unconscious process.



Quirks of Memory

A Retrieval System Roundup
The unique brains of those with Highly Superior Autobiographical Memory (HSAM) 
In 2006, Parker, Cahill and McGaugh reported the first known case of Highly Superior Autobiographical Memory (HSAM) in a research participant known as “AJ”. When provided with a date, AJ could specify on which day of the week it fell and what she did that day. Since then, more people with this extraordinary ability have been identified (click here to view a “60 Minutes” episode on them or here for another Psychology Today blog post on this), and researchers have now discovered structural brain differences in people with HSAM compared to people without it (LePort et al., 2012). This is especially interesting given that people with HSAM do not show exceptional memory in other domains besides autobiographical memory. Among the brain differences that the researchers note is “amplified white matter tract coherence” (p. 12), which they suggest may indicate that the transfer of information among connecting neural regions is enhanced in participants with HSAM and that this may contribute to their superior autobiographical memories.

As LePort and colleagues point out, however, whether the structural brain differences that they discovered are a cause of HSAM or the result of activities that themselves cause HSAM is not yet known.

It might be easy to jump to the conclusion that people with HSAM are simply born with brains that differ from normal brains and that innate structural differences in the brains of people with HSAM are what allow for their exceptional autobiographical memory abilities. For example, maybe they are born with enhanced connectivity among brain regions critical to autobiographical memory.

A more interesting possibility, however, is that the brain differences (as well as the remarkable autobiographical memory ability) result from unique experiences that occur during development.

Experiences themselves cause changes in the brain to take place. For example, it has long been known that the brains of rats exposed to an enriching environment during development differ from those of rats exposed to an impoverished environment—rats in an enriched environment show increased cortical weight and numbers of glial cells and also show benefits to memory ability.

Research on musical training is an excellent example of how experiences can impact the structure of the human brain, as discussed in this New York Times article and this Scientific American blog and reviewed here.
Researchers have known for some time that the brains of musicians differ from those of non-musicians, but researchers have questioned whether this is due to innate differences between musicians and non-musicians. However, recent evidence suggests that musical training itself contributes to the brain differences between the musically trained and untrained. One study showed that children given 15 months of musical training exhibited structural changes in their brain relative those that did not. More recently, researchers at Northwestern showed that neural changes that appear to result from musical training in childhood persist into adulthood.

If structural brain differences between the musically-trained and untrained in adulthood can result from childhood training in that domain, then what type of experience or training could potentially underlie the brain differences shown in people with HSAM?

Actress Marilu Henner, who was one of the participants in the research by McGaugh and colleagues (as shown in this "60 Minutes" episode), may provide some clues in her book on her experience with HSAM and on autobiographical memory. In it, she describes a pastime of hers during childhood. “I decided to play a little game with myself, in which I tried to remember every day that had led up to that moment starting with the most recent What did I do a week ago? Two weeks ago? Three weeks ago? I even started to go back to the previous years and the year before that, remembering specific days from first grade and kindergarten. Over time, this exercise became not only my routine to fall asleep, but also a way to mentally challenge and exercise my brain to the point that I could ‘time-travel’ back to: What did we do each day of our vacation? What was I doing when I was exactly the day my younger brother Lorin’s age? My Niece Lizzy’s age?”

It seems plausible that this type of “training” or memory practice during childhood could lead to structural changes in the brain that are detectable in adulthood and correlated with HSAM.

As McGaugh and colleagues suggest in their article, future research on children with HSAM might shed light on this issue. But perhaps an approach similar to that taken with recent research on musical training could be taken as well. Specifically, maybe children could be randomly assigned to either a no-memory-training control condition or to an autobiographical memory training condition in which they receive a daily autobiographical memory training exercise similar to what Marilu Henner describes in her book. Would structural brain differences be shown 15 months later? If so, would they still be shown in adulthood? Would characteristics of HSAM be found? This would be an interesting study indeed.






Science News

... from universities, journals, and other research organizations
 

Brains Are Different in People With Highly Superior Autobiographical Memory



July 30, 2012


UC Irvine scientists have discovered intriguing differences in the brains and mental processes of an extraordinary group of people who can effortlessly recall every moment of their lives since about age 10.


UC Irvine scientists have discovered intriguing differences in the brains and mental processes of an extraordinary group of people who can effortlessly recall every moment of their lives since about age 10. (Credit: © James Steidl / Fotolia)

 
The phenomenon of highly superior autobiographical memory -- first documented in 2006 by UCI neurobiologist James McGaugh and colleagues in a woman identified as "AJ" -- has been profiled on CBS's "60 Minutes" and in hundreds of other media outlets. But a new paper in the peer-reviewed journal Neurobiology of Learning & Memory's July issue offers the first scientific findings about nearly a dozen people with this uncanny ability.

All had variations in nine structures of their brains compared to those of control subjects, including more robust white matter linking the middle and front parts. Most of the differences were in areas known to be linked to autobiographical memory, "so we're getting a descriptive, coherent story of what's going on," said lead author Aurora LePort, a doctoral candidate at UCI's Center for the Neurobiology of Learning & Memory.

Surprisingly, the people with stellar autobiographical memory did not score higher on routine laboratory memory tests or when asked to use rote memory aids. Yet when it came to public or private events that occurred after age 10½, "they were remarkably better at recalling the details of their lives," said McGaugh, senior author on the new work.

"These are not memory experts across the board. They're 180 degrees different from the usual memory champions who can memorize pi to a large degree or other long strings of numbers," LePort noted. "It makes the project that much more interesting; it really shows we are homing in on a specific form of memory."

She said interviewing the subjects was "baffling. You give them a date, and their response is immediate. The day of the week just comes out of their minds; they don't even think about it. They can do this for so many dates, and they're 99 percent accurate. It never gets old."

The study also found statistically significant evidence of obsessive-compulsive tendencies among the group, but the authors do not yet know if or how this aids recollection. Many of the individuals have large, minutely catalogued collections of some sort, such as magazines, videos, shoes, stamps or postcards.

UCI researchers and staff have assessed more than 500 people who thought they might possess highly superior autobiographical memory and have confirmed 33 to date, including the 11 in the paper. Another 37 are strong candidates who will be further tested.

"The next step is that we want to understand the mechanisms behind the memory," LePort said. "Is it just the brain and the way its different structures are communicating? Maybe it's genetic; maybe it's molecular."

McGaugh added: "We're Sherlock Holmeses here. We're searching for clues in a very new area of research."

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Story Source:
The above story is based on materials provided by University of California - Irvine.
Note: Materials may be edited for content and length. For further information, please contact the source cited above.

Journal Reference:
  1. Aurora K.R. LePort, Aaron T. Mattfeld, Heather Dickinson-Anson, James H. Fallon, Craig E.L. Stark, Frithjof Kruggel, Larry Cahill, James L. McGaugh. Behavioral and neuroanatomical investigation of Highly Superior Autobiographical Memory (HSAM). Neurobiology of Learning and Memory, 2012; 98 (1): 78 DOI: 10.1016/j.nlm.2012.05.002