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. 2011 Jun 20;22(3):567–576. doi: 10.1093/cercor/bhr119

Figure 2.

Figure 2.

Perceptual expectation modulates repetition suppression when stimuli are attended. (A) Average stimulus-evoked response time courses to adapter (BLANK) and probe (SAME, DIFF) stimuli in FFA (upper panels) and V3A (lower panels) for frequent repetition runs (left hand panels) and infrequent repetition runs (right hand panels) in the focused attention condition (FOCUS). For SAME and DIFF trials, only the response components evoked by the probe stimuli are shown (obtained by subtracting the response to the BLANK trials from the overall trial-triggered response; see Materials and Methods). Error bars (standard error of the mean across subjects) are smaller than plot symbols. Repetition suppression (larger responses to DIFF than to SAME trials) is greater when stimulus repetitions are frequent than when they are infrequent. (B) Average response amplitudes to probe stimuli across visual areas for the SAME and DIFF trials for frequent repetition runs (left hand panels) and infrequent repetition runs (right hand panels) in the FOCUS condition. In all areas, the magnitude of repetition suppression (larger responses to DIFF than to SAME trials) is greater in the frequent repetition runs than in the infrequent repetition runs. Error bars, standard error of the mean across subjects. Asterisks (*) indicate significant repetition suppression (greater response to DIFF than SAME trials, paired t-test, P < 0.05).