Conditioning in fish (Mollienisia Sp.) as a function of the interval between CS and US

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With an increase in illumination as CS and a 50-ma. dc current US the “percent frequency of CRs was maximum with a 2.0-sec. CS-US interval and decreased progressively on either side of this optimum as the CS-US intervals became shorter and longer, respectively.” This is considerably longer than the optimum interval usually found in man. 2 interpretations are considered. Optimum interval may be related to body temperature in cold blooded animals and the “type of neural organization of animals at different places in the phylogenetic scale.” From Psyc Abstracts 36:01:1EI36N. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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