discrimination problem refers to the behavioral task used in Ungerleider and Mishkin’s experiment in which they provided evidence for the ventral, or what, visual processing stream. Monkeys were required to respond to an object with a particular shape.
cognitive capacity described by the developmental Psychologist Jean Piaget , which is initially absent in the infant, but subsequently develops. The infant is unable to store in memory a representation of an object that is removed from view. In essence, what is out of sight is "out of mind."