Co-opting Mental Machinery

The human mind is great at pattern recognition, but it is not the only brain that can recognize a pattern. Pigeons can recognize patterns for food distribution with button presses, mice can remember mazes and navigate through complex patterns to a reward, and other animals can recognize patterns in hunting, mating, and other activities. What humans do differently is use pattern recognition to determine causal structures by imagining and testing alternative hypotheses. This is a crucial step beyond the pattern recognition of other animals.
In The Book of Why Judea Pearl writes, “It is not too much of a stretch to think that 40,000 years ago, humans co-opted the machinery in their brain that already existed for pattern recognition and started to use it for causal reasoning.” This idea is interesting because it explains our pattern recognition linkage with other animals and helps us think about how brain structures and ways of thinking may have evolved.
In isolation, a brain process is interesting, but not as interesting as when considered alongside similar brain processes. When we look at pattern recognition and its similarities to causal reasoning, we see a jumping off point. We can see how brain processes that helped us in one area opened up new possibilities through development. This helps us think more deeply about the mental abilities that we have.
The ways we think and how our brains work is not static. Different cultural factors, environmental factors, and existing brain processes can all shape how our brains work and evolve individually and as a species.  As Pearl notes, it is likely that many of our brain processes co-opted other mental machinery for new purposes. Very few of what see in human psychology can be well understood in isolation. Asking why and how evolution could have played a role is crucial to understanding who we are now and how we got to this point. Causality is not something that just existed naturally in the brain. It was built by taking other processes and co-opting them for new purposes, and those new purposes have allowed us to do magnificent things like build rockets, play football, and develop clean water systems.

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