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  • Title: Timing in pigeons: effects of the similarity between intertrial interval and gap in a timing signal.
    Author: Kaiser DH, Zentall TR, Neiman E.
    Journal: J Exp Psychol Anim Behav Process; 2002 Oct; 28(4):416-22. PubMed ID: 12395499.
    Abstract:
    Previous research suggests that when a fixed interval is interrupted (known as the gap procedure), pigeons tend to reset memory and start timing from 0 after the gap. However, because the ambient conditions of the gap typically have been the same as during the intertrial interval (ITI), ambiguity may have resulted. In the present experiment, the authors found that when ambient conditions during the gap were similar to the ITI, pigeons tended to reset memory, but when ambient conditions during the gap were different from the ITI, pigeons tended to stop timing, retain the duration of the stimulus in memory, and add to that time when the stimulus reappeared. Thus, when the gap was unambiguous, pigeons timed accurately.
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