Why human memory is not a bit like a computer’s

DisintegrationofPersistence(This is a cross-post of a 3 Quarks Daily article I wrote last year.)

A few months ago I attended a rather peculiar seminar at MIT’s Department of Brain and Cognitive Sciences. A neuroscientist colleague of mine named Robert Ajemian had invited an unusual speaker: a man named Jim Karol, who was billed as having the world’s best memory. According to his website, his abilities include “knowing over 80,000 zip codes, thousands of digits of Pi, the Scrabble dictionary, sports almanacs, MEDICAL journals, and thousands of other facts.” He has memorized the day of the week for every date stretching back to 1AD. And his abilities are not simply matter of superhuman willingness to spend hours memorizing lists. He can add new items to his memory rapidly, on the fly. After a quick look at a deck of cards, he can recall perfectly the order in which they were shuffled. I witnessed him do this last ‘trick’, as well as a few others, so I can testify that his abilities are truly extraordinary [1].

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“The first rule of intelligence: Don’t talk about your intelligence”

That line is from an article in The Atlantic about how poor people are at self-assessment:

People Don’t Actually Know Themselves Very Well

“The first rule of intelligence: Don’t talk about your intelligence. It’s something you prove, not something you claim. As comedian Patton Oswalt quipped about humor, the only person who goes around saying “I’m funny” is a not-funny person. If you were really funny, you’d just make people laugh.”

To me this kind of thing is pretty obvious, but I guess some people really need to be reminded of it.

Here’s another paragraph with several important reminders, particularly for people who blather about intelligence and cognitive biases:

“This is why people consistently overestimate their intelligence, a pattern that seems to be more pronounced among men than women. It’s also why people overestimate their generosity: It’s a desirable trait. And it’s why people fall victim to my new favorite bias: the I’m-not-biased bias, where people tend to believethey have fewer biases than the average American. But you can’t judge whether you’re biased, because when it comes to yourself, you’re the most biased judge of all. And the more objective people think they are, the more they discriminate, because they don’t realize how vulnerable they are to bias.”

The kind of brain training that actually works!

Just saw this on twitter:

Here’s the link to the (thus far unreviewed!) study:

How much does education improve intelligence? A meta-analysis

“… we found consistent evidence for beneficial effects of education on cognitive abilities, of approximately 1 to 5 IQ points for an additional year of education. Moderator analyses indicated that the effects persisted across the lifespan, and were present on all broad categories of cognitive ability studied. Education appears to be the most consistent, robust, and durable method yet to be identified for raising intelligence.”

A group composed of brilliant individuals will not automatically be the most brilliant group

Perhaps the whole can be better than the sum of its parts?

I came across a very interesting study on McGill University’s excellent Brain from Top to Bottom Blog.

In this study of collective intelligence, the researchers performed numerous statistical analyses. The most interesting finding that emerged from them, and that went beyond the debate about just what exactly collective intelligence might represent, was that this factor was not highly correlated with either the average intelligence of the groups’ members or with the intelligence of the group member who had scored the highest on the individual-intelligence test. In other words, a group composed of brilliant individuals will not automatically be the most brilliant group.
The psychologists did find some factors that let them predict whether a given group would be collectively intelligent. But to identify three, they had to look at factors associated with co-operation. The first such factor was the group’s overall social sensitivity—the members’ ability to perceive each other’s emotions. The second factor was equality in taking turns speaking during group decision-making. The third factor was the proportion of women in the group. This last finding is highly consistent with other data showing that women tend to be more socially sensitive than men and to take turns speaking more naturally than men do.



via The Collective Intelligence of Groups