Effects of intra-nasally administered testosterone on sexual proceptive behavior in female capuchin monkeys (Cebus apella).

Sexual dysfunction in the female has been associated with a decrease in androgen levels, which can be reversed by testosterone treatment, however, bearing the risk of adverse side effects. Nasally administered testosterone could be an effective method for androgenic treatment avoiding the first-pass intestinal and hepatic metabolism and side effects. Here we examined the effects of chronic intranasal administration of testosterone on sexual behavior in female capuchin monkeys (Cebus apella) that lived with male cohorts.

Influence of stimuli size on color discrimination in capuchin monkeys.

Large-field trichromacy is a general feature of protanope and deuteranope humans, provided that the stimuli size extends to an 8 degrees visual angle. In this study we compared the performance of five male and three female tufted capuchin monkeys (Cebus apella) in discriminating pairs of Munsell color papers. Human subjects were also studied in two-choice discrimination tests, using the same stimuli and apparatus employed for the monkeys.

Color vision perception in the capuchin monkey (Cebus apella): a re-evaluation of procedures using Munsell papers.

In previous experiments based on color vision discrimination of Munsell chips, Pessoa et al. (Behav Brain Res 1997;89:285-8) presented evidence of trichromatic color vision in capuchin monkeys. However, the possibility of subjects using brightness cues was not eliminated.