To replicate and extend the previously reported preference for warning in an unavoidable shock situation rats were tested individually in a two-compartment grid shuttle box and whether a preference for signal prior to unavoidable shock could be established over a shock-alone condition was observed. Ss were tested at warning durations of 3, 5, 10, 20 and 30 sec. All Ss exhibited a clear preference for the signal-shock condition, regardless of duration of warning.
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