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Tone sequence sensitivity of cortical neurons. (A) Percent recording sites with facilitated (Upper) or suppressed (Lower) responses to CF tone when it was preceded by a masker tone of 3 kHz or 1.5, 7, and 10 kHz for different CF categories. (B) Average facilitation indices of cortical responses to CF tone under different stimulus conditions. Error bars represent mean ± SEM. *P < 0.025.
