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- The brain is significantly bigger than any current computer. The brain is estimated to have
25,000,000,000,000,000 (25 million billion) interactions among axons, dendrites, neurons, and
neurotransmitters, and that doesn’t include the approximately 1 trillion glial cells that may also be important for
information processing and memory.
Although cognitive psychology began in earnest at about the same time that the electronic computer was first being
developed, and although cognitive psychologists have frequently used the computer as a model for understanding
how the brain operates, research in cognitive neuroscience has revealed many important differences between brains
and computers. The neuroscientist Chris Chatham (2007) [3] provided the list of differences between brains and
computers shown here. You might want to check out the website and the responses to it
athttp://scienceblogs.com/developingintelligence/2007/03/why_the_brain_isnot like_a_co.php.
We will begin the chapter with the study of memory. Our memories allow us to do relatively
simple things, such as remembering where we parked our car or the name of the current
president of the United States, but also allow us to form complex memories, such as how to ride
a bicycle or to write a computer program. Moreover, our memories define us as individuals—
they are our experiences, our relationships, our successes, and our failures. Without our
memories, we would not have a life.
At least for some things, our memory is very good (Bahrick, 2000). [4] Once we learn a face, we
can recognize that face many years later. We know the lyrics of many songs by heart, and we can
give definitions for tens of thousands of words. Mitchell (2006) [5] contacted participants 17
years after they had been briefly exposed to some line drawings in a lab and found that they still
could identify the images significantly better than participants who had never seen them.
For some people, memory is truly amazing. Consider, for instance, the case of Kim Peek, who
was the inspiration for the Academy Award–winning film Rain Man (Figure 8.1 "Kim
Peek" andNote 8.5 "Video Clip: Kim Peek"). Although Peek’s IQ was only 87, significantly
below the average of about 100, it is estimated that he memorized more than 10,000 books in his
lifetime (Wisconsin Medical Society, n.d.; “Kim Peek,” 2004). [6] The Russian psychologist A.
R. Luria (2004) [7] has described the abilities of a man known as “S,” who seems to have
unlimited memory. S remembers strings of hundreds of random letters for years at a time, and
seems in fact to never forget anything.