Color discrimination by rhesus monkeys

Pretraining and discrimination reversal learning by rhesus monkeys

Groups of five to seven macaques were trained on repeated reversals of a visual (or spatial) discrimination habitafter no pretraining, extended discrimination training, or repeated reversal training on spatial (or visual) cues. Neither sortof pretraining had a significant effect on reversal learning on the second cue. These results indicate that monkeys' capacity to develop generalized "win-sta...

Pattern discrimination learning with rhesus monkeys.

Rhesus monkeys were trained to criterion on a two-stimulus and a fivestimulus pattern discrimination task. The probabilities of response to the various stimuli throughout learning are examined for individual subjects, and it is fOlL'1d that the subjects exhibit consistency in the order and manner in which incorrect stimuli are eliminated. This suggests a simple mathematical description of the p...

Color-detection thresholds in rhesus macaque monkeys and humans.

Macaque monkeys are a model of human color vision. To facilitate linking physiology in monkeys with psychophysics in humans, we directly compared color-detection thresholds in humans and rhesus monkeys. Colors were defined by an equiluminant plane of cone-opponent color space. All subjects were tested on an identical apparatus with a four-alternative forced-choice task. Targets were 2° square, ...

Color discrimination in Caspian pony

Recognizing facial cues: individual discrimination by chimpanzees (Pan troglodytes) and rhesus monkeys (Macaca mulatta).

Faces are one of the most salient classes of stimuli involved in social communication. Three experiments compared face-recognition abilities in chimpanzees (Pan troglodytes) and rhesus monkeys (Macaca mulatta). In the face-matching task, the chimpanzees matched identical photographs of conspecifics' faces on Trial 1, and the rhesus monkeys did the same after 4 generalization trials. In the indi...