Among certain psychologists, there is a belief that the mind is composed of “modules” that have been designed by evolution to account for very specific tasks. This kind of thinking has also been linked to the assertion that the mind is a computer, resulting in the natural rhetorical extension that “modules” are essentially equivalent to the “apps” we have on our phones. Just as your digital device has apps for banking, socializing, navigating, and finding restaurants, your mind has “modules” for tracking resources, socializing, and foraging, or so the argument goes. My own approach to and training in psychology is highly comparative and mechanistic. So, I am sympathetic to the “brain = computer, mind as modules” approach to psychology. I don’t think it is correct, though.
Let’s think this through – and not in an overly academic way. First of all, the brain is not a computer. Both might be machines that deal with inputs and outputs, but many systems deal with inputs and outputs. The solar system, is a collection of matter that handles inputs and outputs in a particular way. A hammer is a system that handles inputs and outputs in a particular way. This does not make the solar system or a hammer computational systems, at least not in any profound way. Similarly, sure, brains and computers share some descriptive features. Both make use of “memory,” both are energy intensive and need a regular replenishment of resources, and both transform information in particular ways. But this does not make brains and computers the same thing. Brains are not computers, even if the brain computes. Ultimately, computers are tools designed by humans for particular tasks. Brains are tools for… well, we’ll get to that.
Secondly, the brain is not composed of modules, even if it is modular. Sure, as we learned in the last post, perception is assembled from “products” that have been created in different areas of the brain. In other words, perception is a distributed process. However, it is a distributed process of shared networks. Just as we discussed with reference to supply chains, different visual “products” do not come from isolated modules. There is no “face” module or “chair” module. Instead, there is a system of shared networks that assemble faces or chairs.
Still, one strength of taking a modular approach to psychology is that it emphasizes the adapted qualities of our psyches. There are indeed deep currents given to our psyches by natural selection. We do seem predisposed to detect cheaters, learn languages, use tools (at least more so than other animals), see and hear a particular range of frequencies, have a sensitized disgust response during the first trimester of pregnancy, and on, and on, and on. Even the most religiously inclined must come to terms with the animal in which each soul resides. Through natural selection, our bodies and minds have been designed to encounter and assemble their worlds in particular ways. This is where the utility of thinking in terms of modules comes in. It allows mind scientists to cleanly carve up their subject matter into the traits and adaptations that allow for research. Every science needs its units, after all.
But let’s not forget that the assembly that is done by our minds is done for a particular reason. Fundamentally the psyche is designed to locate the organism within a problem space. Where am I within this space, and what do I need to do? These are the questions that the psyche faces at every moment of its limited existence. And to answer these questions, the psyche is composed not of modules, but of maps. Perception is essentially a means of creating landmarks, directions, and layers of information on maps. Yes, the supply chains of our perception assemble “percepts,” but on some level, all supply chains, themselves, are mappings of inputs onto outputs. We are not “modules all the way down;” we are maps all the way down. It is not a collection of goods that give our psyches meaning, but directions. Our psyches are composed of, and designed to assemble maps, and in doing so, our psyches search for and achieve meaning.
