NDLI: Perception of shape from shading in chimpanzees (Pan troglodytes) and humans (Homo sapiens)

Content Provider	Springer Nature Link
Author	Tomonaga, Masaki
Copyright Year	1998
Abstract	The perception of shape from shading was tested in two chimpanzees (Pan troglodytes) and five humans (Homo sapiens), using visual search tasks. Subjects were required to select and touch an odd item (target) from among uniform distractors. Humans found the target faster when shading was vertical than when it was horizontal, consistent with results of previous research. Both chimpanzees showed the opposite pattern: they found the target faster when shading was horizontal. The same difference in response was found in texture segregation tasks. This difference between the species could not be explained by head rotation or head shift parallel to the surface of the monitor. Furthermore, when the shaded shape was changed from a circle to a square, or the shading type was changed from gradual to stepwise, the difference in performance between vertical and horizontal shading disappeared in chimpanzees, but persisted in humans. These results suggest that chimpanzees process shading information in a different way from humans.
Starting Page	25
Ending Page	35
Page Count	11
File Format	PDF
ISSN	14359448
Journal	Animal Cognition
Volume Number	1
Issue Number	1
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-07-10
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Experimental and Cognitive Psychology Ecology, Evolution, Behavior and Systematics

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Perception of shape from shading in chimpanzees (Pan troglodytes) and humans (Homo sapiens)