Dynamic in‐hand movements in adult and young juvenile chimpanzees ( Pan troglodytes )

Bibliographic Data

ID8314716
AuthorsJessica Crast (University of Georgia, corresponding author), Dorothy M Fragaszy (0000-0002-4010-4993, University of Georgia), Dorothy Fragaszy, Misato Hayashi (0000-0001-7289-6414, Kyoto University), T Matsuzawa (0000-0002-8147-2725, Kyoto University)
Year2009
Volume138
Issue3
Pages274-285
Publication date2009-03-01
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueAmerican Journal of Physical Anthropology (JOURNAL)
Journal identifiersISSN: 0002-9483 • E-ISSN: 1096-8644
PublisherWiley (PUBLISHER • GB)
DOI10.1002/ajpa.20925
PMID18802939
OpenAlexW2047332266
LanguageEN
Citations received22
References cited38

Descriptions of manual function in nonhuman primates have largely focused on static precision and power grasping (as first defined by Napier, 1956 ), while identification and description of dynamic manual function are rare and incomplete. Here, we describe several forms of in‐hand movements used by chimpanzees ( Pan troglodytes ) when manipulating small objects. In‐hand movements are defined as the movement of an object within one hand via manipulation of the digits. We presented adult and young juvenile chimpanzees (ages 5–29 years) with a task that required inserting small objects through correspondingly shaped cutouts in a transparent Plexiglas panel. While attempting to insert the objects through the cutouts, the subjects used at least two forms of in‐hand movements to change their grip on the object for more precise alignment. We describe in detail the in‐hand movements they used and the variability observed in form and execution among the subjects. In general, the adult subjects used in‐hand movements more frequently and used a wider variety of forms than did the young juvenile subjects, suggesting that in‐hand movements are in the process of fine‐tuning around the age of 5 years in chimpanzees. The dexterity exhibited by the adults, however, shows that the neuromuscular and morphological requirements for relatively complex digital manipulation are present in the adult chimpanzee. Am J Phys Antropol, 2009. © 2008 Wiley‐Liss, Inc

Acoustics · Adult male · Biology · Cognitive psychology · Juvenile · Movement (music) · Object (grammar) · Process (computing) · Troglodytes · Zoology · Action Observation and Synchronization · Artificial Intelligence · Communication · Computer Science · Ecology · Motor Control and Adaptation · Primate Behavior and Ecology · Psychology

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