Infancy and the optimal level of stimulation.
D000367:Age Factors; D001288:Attention; D002657:Child Development; D003071:Cognition; D005106:Exploratory Behavior; D005260:Female; D005403:Fixation, Ocular; D005556:Form Perception; D006801:Humans; D007223:Infant; D007257:Information Theory; D008297:Male