Visual flow influences gait transition speed and preferred walking speed.

It is typically assumed that basic features of human gait are determined by purely biomechanical fac- tors. In two experiments, we test whether gait transition speed and preferred walking speed are also inXuenced by visual information about the speed of self-motion. The visual Xow during treadmill locomotion was manipulated to be slower than, matched to, or faster than the physical gait speed (visual gains of 0.5, 1.0, 2.0). Higher Xow rates elicit signiWcantly lower transition speeds for both the Walk-Run and Run-Walk transition, as expected. Similarly, higher Xow rates elicit signiWcantly lower preferred walking speeds. These results suggest that visual information becomes calibrated to mechanical or energetic aspects of gait and contributes to the control of locomotor behavior.