Abstract
Three rats were trained to press a lever on a random-interval 1min schedule of food reinforcement. In successive phases of the experiment, electric shocks were superimposed at 1-min fixed intervals, 2-min fixed intervals, or at 1-min random intervals. In the fixed-interval conditions, there was a steep gradient of reduction in response rate as the time for the next shock approached; in the random-interval condition, the response rate following a shock was relatively constant. The present method appears to be adequate to monitor the instantaneous level of fear. The results suggest that animals were timing in units proportional to the fixed interval and that aversive events which occur randomly in time are perceived as phenomenologically random by the rat.
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Annau, Z., & Kamin, L. J. The conditioned emotional response as a function of the intensity of the US. Journal of Comparative & Physiological Psychology, 1961, 54, 428–432.
Black, A. H. Automonic aversive conditioning in infrahuman subjects. In F. R. Brush (Ed.),Aversive conditioning and learning. New York: Academic Press, 1971. Pp. 3–104.
Church, R. M. Aversive behavior. In J. W. Kling and L. A. Riggs (Eds.),Woodworth and Schlosberg’s experimental psychology, 3rd ed. New York: Holt, 1971. Pp. 703–741.
Church, R. M., & Getty, D. J., Some consequences of the reaction to an aversive event. Psychological Bulletin, 1972, 78, 21–27.
Gibbon, J. Scalar timing and semi-Markov chains in free-operant avoidance. Journal of Mathematical Psychology, 1971, 8, 109–138.
Gibbon, J. Timing and discrimination of shock density in avoidance. Psychological Review, 1972, 79, 68–92.
Rescorla, R. Pavlovian conditioning and its proper control procedures. Psychological Review, 1967, 74, 71–80.
Seligman, M. E., Maier, S. F., & Solomon, R. L. Unpredictable and uncontrollable aversive events. In F. R. Brush (Ed.),Aversive conditioning and learning New York: Academic Press, 1971. Pp. 347–400.
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This investigation was supported by Research Grant MH-19704 from the National Institute of Mental Health.
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LaBarbera, J.D., Church, R.M. Magnitude of fear as a function of expected time to all aversive event. Animal Learning & Behavior 2, 199–202 (1974). https://doi.org/10.3758/BF03199177
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DOI: https://doi.org/10.3758/BF03199177