Bloomstrand, M. A., Young, S. P. 1988. The use of videotapes as enrichment for singly housed chimpanzees. American Journal of Primatology 14, 411 (Abstract).

Each of six adult group-housed chimpanzees was placed in a single cage for 20-minute sessions during which a variety of videotapes were shown. The chimpanzees' response varied according to individuals and content of tape.