Self-punitive running in the rat following start box fear conditioning: Shock intensity effects

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In Phase 1 of an experiment with 240 female hooded rats, buzzer-alone presentations or buzzer-shock pairings were given in the start box of a 4-ft straight alley. Phase 2 consisted of runway test trials during which there was no shock in the alley or there was shock in the last 2 ft. Shock levels employed in each phase were 0, 40, 53, and 70 v. All Phase 1 nonshock Ss ceased running by Trial 3. In general, for Ss shocked in Phase 1, running speed and the number of Ss completing all 60 trials were greater for shocked than nonshocked Phase 2 conditions. In addition, the stronger the Phase 1 shock, the greater the number completing all trials and the faster the speeds. Phase 2 shock intensity was not a significant factor. (15 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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