How often do you hear someone say that the brain is a computer? This statement is not literally true. The brain is certainly not like a desktop computer. Brains don’t look like computers; there’s no CPU in the head. Neurons aren’t all wired together to an executive control center. Human brains have a massively parallel architecture. Cognitive scientists who have carefully thought through this issue arrive at this same conclusion: the brain does not really resemble a computer, certainly not any sort of computer in general use today.
The brain as computer is a seductive metaphor. According to Edwin Hutchins, “The last 30 years of cognitive science can be seen as attempts to remake the person in the image of the computer.” See Cognition in the Wild (1996).
Metaphors are models, however, and models are imperfect versions of the reality they portray. Metaphors accentuate certain parts of reality while downplaying other parts.
Unfortunately, many people “reify” the brain-as-computer metaphor: they accept this metaphor as literal truth, leading to various misunderstandings about human cognition.
Here’s another big difference between brains and computers: human cognition is fault-tolerant and robust. In other words, our minds continue to function even when the information is incomplete (e.g., while we’re driving in the rain) or when our purposes or options are unclear (e.g., navigating a cocktail party). Computers, on the other hand, are always one line of code away from freezing up.
In Bright Air, Brilliant Fire: On the Matter of the Mind (1992) Gerald M. …