The social factors that influence cooperation have remained largely uninvestigated but have the potential to explain much of the variation in cooperative behavior observed in the natural world. We show here that certain dimensions of the social environment, namely the size of the social group, the degree of social tolerance expressed, the structure of the dominance hierarchy, and the patterns o...

The ability to recognize a conspecific signal is essential to communication. In addition to recognizing the type of call, receivers extract a range of information from the signal about the producer, including identity, sex and dialect. Despite the apparent ease with which this is accomplished, few available data address the computational processes underlying recognition. While it is possible th...

EBV-carrying human cell lines, depending on whether the cells are derived from Burkitt's lymphoma (BL) tumor biopsies or transformed by EBV in vitro, have different growth properties in vitro. In contrast, there are no clear differences between tamarin tumor lines and tamarin LCLs in vitro. Both types of tamarin cell lines could grow in agarose and formed colonies unlike human LCLs, althoug...

ebv-carrying human cell lines, depending on whether the cells are derived from burkitt's lymphoma (bl) tumor biopsies or transformed by ebv in vitro, have different growth properties in vitro. in contrast, there are no clear differences between tamarin tumor lines and tamarin lcls in vitro. both types of tamarin cell lines could grow in agarose and formed colonies unlike human lcls, althou...

Theories of music evolution agree that human music has an affective influence on listeners. Tests of non-humans provided little evidence of preferences for human music. However, prosodic features of speech ('motherese') influence affective behaviour of non-verbal infants as well as domestic animals, suggesting that features of music can influence the behaviour of non-human species. We incorpora...

In 1972 a conference of biologists from diverse disciplines was held at Washington under the auspices of the Wild Animal Propagation Trust (WAPT), the National Zoological Park, and the New York Zoological Society. Its purpose was to review and summarise information pertinent to marmoset and tamarin biology. It was hoped also that the cross-fertilisation of ideas and knowledge would especially b...

This study tested the hypothesis that cooperative breeding facilitates the emergence of prosocial behavior by presenting cottontop tamarins (Saguinus oedipus) with the option to provide food rewards to pair-bonded mates. In Experiment 1, tamarins could provide rewards to mates at no additional cost while obtaining rewards for themselves. Contrary to the hypothesis, tamarins did not demonstrate ...