A test of the thirst-deprivation trace hypothesis in the hooded rat.

Abstract

"The results of these experiments, the second being essentially a replication of the first, confirmed the O'Kelly and Heyer thirst-deprivation trace hypothesis in terms of its facilitory effect on a previously learned act. The mean number of runs through an enclosed alley corresponding to 0, ½, 1, 2, 3, and 4 hr. of delay (the time allowed to elapse between the injection and the test) following a subcutaneous injection (3.0 cc/kg) of 15% NaCl, in 15 min. increased significantly with increased delay. Water intake, and presumably the need state, was the same for each group. The effective motivational variable can therefore increase independently of the need state." From Psyc Abstracts 36:01:1EF12W. (PsycINFO Database Record (c) 2006 APA, all rights reserved)