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Network impulse response functions for left primary motor and premotor cortex during right hand tapping. Probability density (0.025–0.975) estimated via bootstrap is color-coded for each response function. A 1 SD impulse to the premotor cortex causes a small but sustained increase in the motor cortex while a 1 SD impulse to the primary motor cortex causes a smaller, less sustained decrease in the premotor cortex.
