Apparatus for the differential visual depth threshold and its determination in the hooded rat

Abstract

A modification of the visual cliff is described that permits measurement of the differential visual depth threshold, the point of relative indifference in choice of the shallow side as compared to the deep side of the visual cliff as the deep side is brought closer to the glass. All illumination comes from below the glass to permit equal illumination on the two sides. An experiment with the hooded rat showed that its threshold for differential visual depth is with the deep side about 3-1/2 in. below the shallow side of the visual cliff. © 1968, Psychonomic Journals. All rights reserved.