FIG. 11.

Summary diagram of the heterogenic inhibition among ankle and knee extensors present during locomotion in the spontaneously locomoting premammillary cat and during XER in the intercollicular decerebrate cat. Heterogenic inhibition from G onto PLAN and FHL in the premammillary cat during locomotion remained of similar strength and sign to heterogenic inhibition found in the intercollicular cat during XER, whereas heterogenic inhibition from PLAN or FHL onto G was significantly weaker. - - -, those reflexes that appeared to be modulated between XER and treadmill stepping. The net effect of the modulation was to produce a proximal to distal gradient of inhibition.