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As Greg pointed out to the class

there are synaptic connections that are forged when we learn something. It creates a neural pathway that is quite functional. It allows our brains to conserve energy and thinking power once something has become a routine. For instance

consider the experience of arriving at home after a routine drive without consciously remembering the journey! This is often called “unconscious competence” and is the final destination of a learning journey. This is functional from the point of view of conserving energy for what we might need to pay attention to — threats in the environment

for instance.