I think what we call rationality is the most likely (aka most active path, when some cost timer in the brain runs out), one can restart it and train it for long

I think what we call rationality is the most likely (aka most active path, when some cost timer in the brain runs out), one can restart it and train it for long periods, but usually its attention is fleeting, because attention is expensive and should be on important things, like food, group, booty and nothing.