Discrimination of intertrial intervals in cross-modal transfer of duration
Twenty rats were trained to press one lever (“short”) following a 2-sec light signal and the other lever (“long”) following an 8-sec light signal. The interval from the end of one trial to the onset of the signal on the next trial was 30 sec. Half the animals were tested on a discrimination between 2-sec and 8-sec noise signals with the same response rule (nonreversal); half were tested with the opposite response rule (reversal). On cross-modal testing, the nonreversal group was correct more often than chance; the reversal group was correct less often than chance. When signals were omitted, the animals performed better than chance, indicating that they discriminated the difference in time from the end of one trial until the opportunity for a choice on the next trial (32 vs. 38 sec). © 1982, The psychonomic soceity, inc. All rights reserved.
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