Abstract # 36:

Scheduled for Thursday, June 21, 2007 02:45 PM-03:00 PM: Session 6 (North Main Hall F/G) Oral Presentation

Selection of multi-destination routes by chimpanzees (Pan troglodytes)

C. R. Menzel1, J. W. Kelley1, B. Chan1, M. L. Hoffman1, S. A. Hunsberger1 and E. W. Menzel2
1Language Research Center, Georgia State Univ., 3401 Panthersville Rd., Decatur, GA 30034, USA, 2SUNY, Stony Brook
     In chimpanzees, travel efficiency depends on memory organization. Hypotheses on how chimpanzees recover dispersed resources in a large-scale environment include recall and rank ordering of the expected value of goals. However, the specific psychological processes and criteria by which chimpanzees rank order and sequentially visit resources over a wide area have not been characterized in detail. Two adult captive chimpanzees, tested individually, watched as an experimenter hid multiple food containers in unique locations in a forest. Later, the chimpanzee recruited otherwise uninformed caregivers and directed them to each container. The sequence in which containers were recovered was highly orderly and was far more efficient than expected by chance [Friedman's Test, a=0.01]. In addition to showing long-term memory of each location, the chimpanzees prioritized the locations by food quantity, type, and proximity. Under some conditions the chimpanzees minimized the distance the caregiver had to travel. Research supported by HD-38051, MH-58855, the L.S.B. Leakey Foundation, and the Wenner-Gren Foundation.