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0% Intensity Gap

0% Intensity Gap

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FIGURE 12.4 Comparative studies of the gap procedure in pigeons and rats. Upper panels: Initial accounts of species differences in the gap procedure; rats are "stoppers" (left) (adapted from Roberts, S., J. Exp. Psychol. Anim. Behav. Process, 7, 242-268, 1981) and pigeons are "resetters" (right) (adapted from Cabeza de Vaca, S. et al., J. Exp. Psychol. Anim. Behav. Process, 20, 184-198, 1994). Middle panels: Rats stop timing during a dark gap (left) and reset timing after an illuminated gap (right). (Adapted from Buhusi, C.V. and Meck, W.H., J. Exp. Psychol. Anim. Behav. Process, 26, 305-322, 2000.) Lower panels: Pigeons stop timing during a gap of 30% light intensity (left) and reset timing after a gap of 0% intensity (right). (Adapted from Buhusi, C.V. et al., J. Comp. Psychol., 2002.)

Moreover, Buhusi et al. (2002) found that pigeons flexibly use the stop and reset rules depending on the intensity of the interrupting event in the specific trial (see also Wilkie et al., 1994). In accord with previous results, Buhusi et al. (2002) found that when timing for the presence of a visual stimulus (100% intensity), a 10-sec dark (0% intensity) gap prompted pigeons to restart timing after the gap (lower right

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