![]() ![]() ![]() Users should refer to the original published version of the material for the full abstract. No warranty is given about the accuracy of the copy. However, users may print, download, or email articles for individual use. Copyright of Primates is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission.We concluded that affiliation and individual experience determines the transmission of handclasp grooming among captive chimpanzees. In addition, in nearly all dyads formed, at least one individual had been previously observed to handclasp groom. As predicted, the formation of new handclasp grooming dyads was positively correlated with the rate of overall grooming and proximity within a dyad. A quadratic assignment procedure was used to compare correlations among observed frequencies of grooming and proximity with handclasp grooming in all possible dyads within the group. ![]() It is a striking variant of normal social grooming, shown in some populations of these apes but not in others. We predicted that dyads with strong affiliative ties, measured by time spent in proximity to and grooming one another, were likely to develop a handclasp grooming partnership during the study period. Grooming hand clasp is a behavioral pattern shown by chimpanzees ( Pan troglodytes) and appears to be a rare example of a social custom, and thus is an indicator of nonhuman culture. We report on the frequency, bout duration, and number and demography of performers throughout the study period, and compare these findings to those reported for wild populations. In the present study, the origination and spread of handclasp grooming in a group of captive chimpanzees was followed throughout more than 1,500 h of observation over a period of 12 years. However, statistical comparisons among factors thought to influence how a behavior spreads within a group have never, to our knowledge, been conducted. wild chimpanzees by McGrew and Tutin 1978 and later found in another com-munity in a different part of Africa by Ghiglieri 1984. The groomer then had only one hand available for grooming Ghiglieri, 1984, p. As with other cultural behaviors, it is assumed that this distinctive grooming posture is learned socially by one individual from another. convention in the Kanyawara community of chimpanzees in Kibale Forest, in Uganda, as follows: one individual, usually the groomer, grasped the hand of its partner and held it aloft. Abstract: Handclasp grooming is a unique social custom, known to occur regularly among some, but not all populations of chimpanzees ( Pan troglodytes). ![]()
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