The immobility reaction in leopard frogs (Rana pipiens) as a function of noise-induced fear

Abstract

Thirty-four frogs served as Ss, with half receiving a loud noise just prior to being immobilized, while the remainder served as a control group. Those exposed to preinduction noise remained immobile significantly longer than did the controls. The results were discussed as providing additional support for the idea that the immobility response represents an innate fear reaction. © 1970, Psychonomic Journals, Inc.. All rights reserved.