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. 1999 Dec 1;521(Pt 2):553–564. doi: 10.1111/j.1469-7793.1999.00553.x

Figure 6. Instantaneous firing frequency and common drive coefficient for motor units situated within FDI.

Figure 6

Individual motor unit potentials and associated TTL pulses for 3 motor units (A) and their associated instantaneous firing frequency (B). Two motor units within the right FDI (R1 and R2) were recorded simultaneously with a motor unit within the left FDI (L1). C-E, cross-correlations between the smoothed instantaneous firing frequencies between the motor units indicated. Note the lack of correlation between motor units recorded within the left and right FDI indicating a lack of common drive to the left and right intrinsic hand muscles.