Inhibition of delay of the two-way avoidance response and warning-signal salience |
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| Authors: | Kazimierz Zieli?ski Tomasz Werka W Jeffrey Wilson Eugeniusz Nikolaev |
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| Institution: | 1. Nencki Institute of Experimental Biology, 3 Pasteur St., 02-093, Warsaw, Poland
2. Indiana University-Purdue University, Fort Wayne, Indiana
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| Abstract: | Effects of extended training (nine sessions, 50 trials each) on two-way avoidance response latencies were studied. For each rat, auditory and visual warning signals (CS) were presented on separate trials, either according to a Gellermann series or in 25-trial blocks. Intermittent presentation of the two kinds of trials yielded shorter latencies and higher levels of avoidance performance in response to the noise CS than in response to the darkness CS. Presentation of trials in blocks revealed stronger response-eliciting properties of stimuli presented during the second half of the session than of those presented during the first half. A significant decrease of avoidance performance in the early portions of the delay period, an index of inhibition of delay, was obtained on auditory trials presented in the second half of the sessions. Results indicate that strong fear of the warning signal is required for inhibition of delay of avoidance responses. |
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