Early visual experience:
Children or chimps who receive only diffuse light input
during early childhood subsequently have difficulty in
pattern recognition.
David Hubel and Torsten Wiesel - won the Nobel prize for
studies in the 70’s and 80’s on sensory deprivation.
   They deprived animals of visual input  (by
closing/suturing the eyelid of one or both eyes) and
analyzing the consequences on visual cortical
development and visual behavior.