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A nonhuman primate's expectations about object motion and destination: The importance of self‐propelled movement and animacy
Author(s) -
Hauser Marc D.
Publication year - 1998
Publication title -
developmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.801
H-Index - 127
eISSN - 1467-7687
pISSN - 1363-755X
DOI - 10.1111/1467-7687.00009
Subject(s) - animacy , object (grammar) , psychology , motion (physics) , cognitive psychology , biological motion , movement (music) , object permanence , feature (linguistics) , perception , contrast (vision) , communication , trajectory , cognition , artificial intelligence , neuroscience , computer science , cognitive development , aesthetics , philosophy , linguistics , physics , astronomy
Human infants have considerable understanding of why objects move and what causes them to take one trajectory over another. Here, we explore the possibility that this capacity is shared with other nonhumans and present results from preferential looking time tests with a New World monkey, the cotton‐top tamarin. Experiments examined whether individuals form different expectations about an object's potential capacity to change locations. Test objects were: 1) self‐propelled, moving, animate; 2) self‐propelled, moving, inanimate; 3) non‐self‐propelled, moving due to an external agent, inanimate; 4) non‐self‐propelled, motionless, inanimate. When category 1 objects, either a live mouse or frog, emerged from behind an occluder in a novel location, this did not affect looking time; subjects appeared to expect such changes. In contrast, when the other objects emerged in a novel location following occlusion from view, subjects looked longer than when the object emerged in the location seen prior to occlusion; such locational changes were apparently not expected. Some feature other than self‐propelled motion accounts for the tamarins’ looking time responses and at least one candidate feature is whether the object is animate or inanimate.