The relative use of proximity, shape similarity, and orientation as visual perceptual grouping cues in tufted capuchin monkeys (Cebus apella) and humans (Homo sapiens)
Journal of Comparative Psychology (2009) - Comment
pubmed: 19236145  doi: 10.1037/a0012674  issn: 0735-7036  issn: 1939-2087 

Giovanna Spinozzi, Carlo De Lillo, Valentina Truppa, Giulia Castorina