brain can be compared to a black box with separated inputs and outputs. inputs consist of external stimula and outputs are the muscular response. visual stimula are coded first by the retina, then by the thalamus, finally through the optical radiations th
x![From the series "Edifying Thoughts of a Tobacco Smoker"](https://www.premioceleste.it/indi/_pics/7/3/2017-101128-417456_17389_6969_t.jpg?m=1494414762 "From the series "Edifying Thoughts of a Tobacco Smoker"")
