Abstract # 130:

Scheduled for Saturday, June 21, 2008 08:30 AM-08:40 AM: Session 14 (Meeting Room 1GHI) Oral Presentation

Processing Spatial Information from 2-Dimensional Stimuli in Rhesus Monkeys (Macaca mulatta)

B. J. Kelly1 and M. A. Novak1,2
1University of Massachusetts, Neuroscience and Behavior Graduate Program, Tobin Hall, Amherst, MA 01003, USA, 2Psychology Department, University of Massachusetts, Tobin Hall, Amherst, MA 01003, USA
     Monkeys appear to be able to recognize objects depicted in 2D stimuli. Monkeys respond to photographs and video in species-appropriate ways, sort photographs into categories, and succeed on cross-modal match-to-sample tasks. We do not know the extent to which monkeys can process spatial information from 2D stimuli. Four monkeys were tested to determine that they could select the photograph of a rubber ball (to which they were previously trained to respond). All four succeeded [Binomial Sign Test, a=0.05]. We subsequently tested each subject on two spatial representation tasks to determine whether they could use spatial information from photographs and video to find their ball on a four-door apparatus. In Experiment 1, monkeys observed photographs of the apparatus with their ball placed in one of the openings and were allowed to search for the ball. In Experiment 2, monkeys watched short video clips of the experimenter hiding the ball on the apparatus, and subsequently searched for the hidden ball. One monkey performed at levels significantly better than chance on both experiments [Binomial Sign Test, a=0.05]. The remaining subjects used unsuccessful alternative search strategies and performed at chance levels. We tested the effects of altering such strategies on performance. We conclude that monkeys do identify objects depicted in photographs; however, using 2D stimuli to process spatial information appears to be a difficult task. Supported by 2007 ASP small grant.