How is human gait controlled by vision?

In his seminal article, Gibson (1958/this issue) laid the foundation for un derstanding the visuomotor transformations necessary for adaptive locomotor behavior. In this article, I review the work on visual control of locomoti on done in our lab in Waterloo and discuss some new experiments. The major findings are put forward as three new postulates. Postulate 1: Visual exter oceptive information about the environment is used in a sampled, feed-forwa rd mode to control locomotion. Postulate 2: Visual exproprioceptive informa tion about the posture and movement of the lower limb is used in a sampled, online mode to control the swing phase trajectory. Postulate 3: Visual exp roprioceptive information about self-motion is used in a sampled, online mo de to control locomotion. Our results in most cases provide empirical suppo rt for the many insightful postulates of Gibson, in some cases amplify his statements, and in a few cases add to our understanding of how we get about by vision.