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(a) 40-ms ISI, including data from the control experiment; (b) 60-ms ISI; (c) 150-ms ISI. Error bars denote s.e.m. Hash marks and asterisks indicate marginally significant and significant post-hoc comparisons, respectively (Newman-Keuls test, #P < 0.07, *P < 0.05, **P < 0.01).
