Acquisition of depth discrimination in a Japanese macaque: a preliminary study

A training method of depth discrimination in a Japanese monkey was reported. Using a Howard-Dohlman type apparatus, the monkey was required to discriminate the distance of two rods. Observation distance was 785 mm and a tracking method was employed. Difference thresholds measured preliminarily were 23.6 mm and 77.1 mm for binocular and monocular conditions, respectively.