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A systematic anterior-posterior gradient of FRFs on the rat face. A, The average amplitude of vibrissa motion in response to bursts of PZ stimulation of the ex vivo β and C1-C4 vibrissae from the left side of a rat face (Table 1). B, Mean vibrissa FRFs plotted as a function of arc location (sampled from n = 8 rats, n = 61 vibrissae). Number of vibrissae per arc is shown in parentheses. Gray bars in A mark the FRF of each vibrissa. Error bars indicate SD.
