Positive geotaxis in infant rats (Rattus norvegicus): a natural behavior and a historical correction

Journal of Comparative Psychology
J R AlbertsJeffrey C Schank

Abstract

Infant rats (Rattus norvegicus) placed on a shallow incline (2 degrees, 4 degrees, or 8 degrees) oriented and moved downhill within 1 min; that is, they displayed positive geotaxis. Their downhill translocation increased with angle of inclination. A variety of possible behavioral elements (e.g., initial orientation, rotational movements, ambulatory velocities) were eliminated as explanations of the geotaxis. Wall contact was recognized as a determinative event: Pups on the inclines showed no orientation with respect to the geogravitational stimulus before contacting a wall. The event of wall contact, however, evoked reliable downhill orientation and more linear movements. Positive geotaxis was created by pups' orientation against walls and an associated increase in movement velocity. This is a distinct perspective on a behavioral response that replaces a traditionally misinterpreted phenomenon. The authors discuss the ecological validity and historical context of these findings.

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Citations

Dec 17, 2011·Behavioural Brain Research·Richelle MychasiukRobbin Gibb
Aug 30, 2008·Developmental Psychobiology·Edith MuciñoRobyn Hudson
Dec 23, 2006·Developmental Psychobiology·Jeffrey R Alberts
Jul 26, 2005·Neurotoxicology and Teratology·Joy C Kreider, Mark S Blumberg
Jul 22, 2005·Neurotoxicology and Teratology·Virginia C Moser
Sep 7, 2011·Developmental Neuroscience·Richelle MychasiukRobbin Gibb

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