Table 1 Minimum volume difference (%) and minimum edge length difference (mm) between three-dimensional objects of the same shape that various primate species visually discriminate above chance level. [x] present study.

From: The ability of captive spider monkeys, Ateles geoffroyi, to visually discriminate between different sizes of food and of non-edible objects

Species

Minimum volume difference (%)

Minimum

edge length difference (mm)

Object

features

Ref.

Spider monkeys

11*

 

ball-shaped, edible

[x]

Spider monkeys

11*

 

cube-shaped, edible

[x]

Spider monkeys

11*

 

hemisphere-shaped, edible

[x]

Chimpanzee

11*

 

cube-shaped, edible

34

Spider monkeys

27

2

cube-shaped, non-edible

[x]

Human subjects

14

3

cube-shaped, non-edible

44

Long-tailed macaques

14

3

cube-shaped, non-edible

44

Chimpanzees

18

4

cube-shaped, non-edible

44

Bonobos

19

4

cube-shaped, non-edible

44

Olive baboons

30

6

cube-shaped, non-edible

44

Rhesus macaques

25

15

cube-shaped, non-edible

45

  1. *Please note that these values are based on a spontaneous preference test whereas all other values are based on operant conditioning tests.
Back to article page