title: The effects of visual surround eccentricity and size on manual and postural control.
abstract: This study investigated how the size and eccentricity of a moving visual surround influence manual and postural control. Twelve subjects performed a manual control task (keep an unstable central display level) and a postural control task (maintain an upright stance) while viewing a visual surround that rotated continuously at 25 degrees C/s. The visual surround consisted of small red squares on a dark background and was presented in four different size/eccentricity conditions: central (approximately 15 degrees C - 60 degrees C), peripheral (approximately 60 degrees C-110 degrees C), full-field (15 degrees C-110 degrees C), or central-peripheral conflict. The results showed that manual control biases in the direction of surround motion are strongly influenced by central-field as well as peripheral-field motion, whereas postural control biases are determined primarily by motion in the peripheral visual field.
authors.affiliation: Crew Technology Division, Armstrong Laboratory, Brooks Air Force Base, Texas 78235-5104, USA.
authors.forename: F H
authors.initials: FH
authors.lastname: Previc
authors.forename: R L
authors.initials: RL
authors.lastname: Neel
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009039:Motion Perception / Q000502:physiology; D010775:Photic Stimulation; D011187:Posture / Q000502:physiology; D012858:Size Perception / Q000502:physiology; D014794:Visual Fields / Q000502:physiology; D014796:Visual Perception / Q000502:physiology*