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Firing rate responses of group Ia and II spindle afferents to trapezoidal length changes with and without concomitant fusimotor stimulation. The firing rates are typical of displacements of about 10% of muscle rest-length and velocities of 0.05 rest length per second. Horizontal bars indicate periods of fusimotor firing. Note the increase in Ia stretch responses with γd stimulation and the biasing effect of γs stimulation (ips: impulses per second) (Prochazka, 1996).
