Fagot, J. & Tomonaga, M. 1999 Global and local processing in humans (Homo sapiens) and chimpanzees (Pan troglodytes): Use of a visual search task with compound stimuli. Journal of Comparative Psychology, 113, 3-12.
Hopkins, W. D. & Washburn, D. A. 2002 Matching visual stimuli on the basis of global and local features by chimpanzees (Pan troglodytes) and rhesus monkeys (Macaca mulatta). Animal Cognition, 5, 27-31
Navon, D. 1977 Forest before trees: The precedence of global features in visual perception. Cognitive Psychology, 9, 353-383.