NDLI: Chimpanzees (Pan troglodytes) show the isolation effect during serial list recognition memory tests

Content Provider	Springer Nature Link
Author	Beran, Michael J.
Copyright Year	2011
Abstract	The isolation effect (or von Restorff effect) occurs when one item in a to-be-remembered list is distinctive from all remaining items, and memory for that item is enhanced. Four chimpanzees were presented with a serial list of four photographs. In the homogeneous condition, all list items were from the same semantic category (e.g., four fruits). In the isolate condition, three items were from the same category, but the fourth item (the isolate) was from a different category (e.g., three fruits and one toy). Then, two photographs were presented, and the chimpanzees had to select the one that was from the list. Two of four chimpanzees were significantly more likely to select a correct isolate item than an item from the same list position in the homogeneous condition for at least some list positions. This facilitation in performance was for isolate items only, as presenting an isolate item in a list did not facilitate greater recognition of other list items compared to the homogeneous condition. These results indicated that some chimpanzees perceived the semantic categories of the photographs, and categorization of photographs led to the isolation effect. Thus, chimpanzees may share with humans some aspects of memory organization that involve spontaneously categorizing visual stimuli and recognizing categorically unique stimuli.
Starting Page	637
Ending Page	645
Page Count	9
File Format	PDF
ISSN	14359448
Journal	Animal Cognition
Volume Number	14
Issue Number	5
e-ISSN	14359456
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-04-13
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Chimpanzees Pan troglodytes von Restorff effect Isolation effect Memory Evolutionary Biology Human Physiology Behavioural Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Experimental and Cognitive Psychology Ecology, Evolution, Behavior and Systematics

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