Visual motion shifts saccade targets

• Published in: Attention, perception & psychophysics Vol. 76; no. 6; pp. 1778 - 1788
• Main Authors: Kosovicheva, Anna A., Wolfe, Benjamin A., Whitney, David
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.08.2014; Springer; Springer Nature B.V
• Subjects: Adult; Behavioral Science and Psychology; Biological and medical sciences; Cognitive Psychology; Eye movements; Female; Fundamental and applied biological sciences. Psychology; Healthy Volunteers; Humans; Male; Motion; Motion Perception - physiology; Motor Reactions; Perception; Programming; Psychology; Psychology. Psychoanalysis. Psychiatry; Psychology. Psychophysiology; Reaction Time - physiology; Reading; Saccades - physiology; Sensory perception; Studies; Vision; Young Adult; 2-D motion; Perception and action; Eye movements; Human; Two dimensional space; Stimulus movement; Vision; Perception; Cognition; Experimental study; Saccadic eye movement
• ISSN: 1943-3921; 1943-393X
• DOI: 10.3758/s13414-014-0680-9

Saccades are made thousands of times a day and are the principal means of localizing objects in our environment. However, the saccade system faces the challenge of accurately localizing objects as they are constantly moving relative to the eye and head. Any delays in processing could cause errors in saccadic localization. To compensate for these delays, the saccade system might use one or more sources of information to predict future target locations, including changes in position of the object over time, or its motion. Another possibility is that motion influences the represented position of the object for saccadic targeting, without requiring an actual change in target position. We tested whether the saccade system can use motion-induced position shifts to update the represented spatial location of a saccade target, by using static drifting Gabor patches with either a soft or a hard aperture as saccade targets. In both conditions, the aperture always remained at a fixed retinal location. The soft aperture Gabor patch resulted in an illusory position shift, whereas the hard aperture stimulus maintained the motion signals but resulted in a smaller illusory position shift. Thus, motion energy and target location were equated, but a position shift was generated in only one condition. We measured saccadic localization of these targets and found that saccades were indeed shifted, but only with a soft-aperture Gabor patch. Our results suggest that motion shifts the programmed locations of saccade targets, and this remapped location guides saccadic localization.