“…In cognitive experiments, primates show different preferences for various still pictures (Fujita, 1990(Fujita, , 1993Fujita & Matsuzawa, 1986;Redican, Kellicut, & Mitchell, 1971;Sacket, 1966;Tanaka, 2003Tanaka, , 2007 and movies (Andrews & Rosenblum, 2001;Brannon, Andrews, & Rosenblum, 2004;Washburn, Gulledge, & Rumbaugh, 1997). On the other hand, Bloomsmith and Lambeth (2000) reported that movies with varying content provided as environmental enrichment do not differentially affect the behavior of chimpanzees. Thus, depending on the particular enrichment or cognitive study, the contents of visual stimuli have been shown to cause differing results.…”