Abstract
The head and eye movements of seven normal subjects were measured while they walked around the perimeter of a disk-shaped platform (120 cm diameter) in light. During this circular walking, head yaw relative to the body compensated for the intensive modulation in body yaw, resulting in smooth head movement in space. The sum of the angular velocities of the head yaw and the slow phases of eye nystagmus was almost zero, indicating that both of these processes functioned in conjunction to maintain a stable gaze in space. The mean roll position of the head tilted inward. No significant head tilt was observed when the subjects walked on a counter-rotating circular treadmill, suggesting that the head tilts were induced by tilting of the gravito-inertial acceleration vector.
