The influence of area and arrangement on visual pattern discrimination by monkeys.

Object Properties Mediating Visual Object Discrimination in the Cat

“…This finding is consonant with those of Warren ( 1953) and Riopelle, Wunderlich, and Francisco (1958) who reported that monkeys tend to react to the borders rather than to the central areas of stimulus cards. Lashley (1938) reports that rats also tend to react to the borders of stimulus cards.…”

Stimulus and Reward Displays in Discrimination Learning

“…The difference in difficulty existing between the 25 per cent problem and the 100 per cent problem is of special interest not only because it confirms earlier data obtained by the displacement procedure (9), but also because the factor is of equal importance in the rotation procedure. The absence of a significant interaction between procedures and problem types is evidence for this interpretation.…”

Spatial variables, observing responses, and discrimination learning sets.

“…Decreased area and increased separation have the same effect: />" is lower than before, and discrimination learning is retarded. This difference has been found repeatedly (Blazek & Harlow, 1955;Harlow, 1945;Schrier & Harlow, 1956, 1957Warren, 1953). Most of these studies have varied the size of the center cues and obtained performance levels that vary directly with size, as would be predicted both from the changes in area and from the changes in separation.…”

“…But this conclusion should be justified only if performance were unrelated to area with constant cue-response separation. Experiments holding separation constant (Leary & Lynn, 1961;Warren, 1953;Zimmermann, 1961Zimmermann, , 1962Zimmermann & Torrey, 1965), described below, have shown that cue area does affect color discrimination by rhesus monkeys. Therefore, for a given cueresponse separation and at least for color cues, it is assumed here that p 0 increases as the cue area increases.…”