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Author (up) SYLVAIN GAGNON,FRANCOISY. DORE openurl 
  Title Search behavior of dogs (Canis familiaris) in invisible displacement problems Type Journal Article
  Year 1993 Publication Animal Learning & Behavior Abbreviated Journal Anim Learn. & Behav.  
  Volume 21 Issue 3 Pages 246-254  
  Keywords  
  Abstract Gagnon and Dor (1992) showed that domestic dogs are able to solve a Piagetian object permanence

task called the invisible displacement problem. A toy is hidden in a container which is

moved behind a screen where the toy is removed and left. Dogs make more errors in these problems

than they do in visible displacement tests, in which the object is hidden directly behind

the target screen. In Experiment 1, we examinedcomponents ofthe standard procedure of invisible

displacements that may make encoding or retention of the hiding location more difficult than

it is in visible displacements. In Experiment 2, we compared dogs performances in visible and

invisible displacement problems when delays of 0, 10, and 20 sec were introduced between the

objects final disappearance and the subjects release. The results revealed that dogs poorer performance

in invisible displacement tests is related to the complex sequence of events that have

to be encoded or remembered as well as to a difficulty in representing the position change that

is signaled, but not directly perceived.
 
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  Call Number refbase @ user @ Serial 538  
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