title: Domesticated dogs' (Canis familiaris) use of the solidity principle.
abstract: Organisms must often make predictions about the trajectories of moving objects. However, often these objects become hidden. To later locate such objects, the organism must maintain a representation of the object in memory and generate an expectation about where it will later appear. We explored adult dogs' knowledge and use of the solidity principle (that one solid object cannot pass through another solid object) by evaluating search behavior. Subjects watched as a treat rolled down an inclined tube into a box. The box either did or did not contain a solid wall dividing it in half. To find the treat, subjects had to modify their search behavior based on the presence or absence of the wall, which either did or did not block the treat's trajectory. Dogs correctly searched the near location when the barrier was present and the far location when the barrier was absent. They displayed this behavior from the first trial, as well as performed correctly when trial types were intermingled. These results suggest that dogs direct their searches in accordance with the solidity principle.
authors.affiliation: Department of Psychology, Hood College, 401 Rosemont Avenue, Room RO 27, Frederick, MD 21701, USA. kundey@hood.edu
authors.forename: Shannon M A
authors.initials: SM
authors.lastname: Kundey
authors.forename: Andres
authors.initials: A
authors.lastname: De Los Reyes
authors.forename: Chelsea
authors.initials: C
authors.lastname: Taglang
authors.forename: Ayelet
authors.initials: A
authors.lastname: Baruch
authors.forename: Rebecca
authors.initials: R
authors.lastname: German
mesh_terms: D000818:Animals; D001070:Appetitive Behavior; D003071:Cognition; D004285:Dogs / Q000523:psychology*; D005260:Female; D008297:Male