Intra-saccadic motion streaks jump-start gaze correction

Published: May 2, 2020, noon

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2020.04.30.070094v1?rss=1 Authors: Schweitzer, R., Rolfs, M. Abstract: Rapid eye movements (saccades) incessantly shift object locations on the retina. To establish object correspondence across saccades, the visual system is thought to match surface features of objects upon saccade landing. Here we assessed if intra-saccadic visual information about an object's retinal trajectory informs this match-making. Ten human observers made saccades to a cued target in a circular stimulus array. Using a visual projection system with high spatiotemporal fidelity, we swiftly rotated this array as the eyes were in flight, displaying continuous or apparent intra-saccadic target motion for 14.6 ms. Observers' saccades could thus land between the target and a distractor, prompting secondary saccades. We tightly controlled the post-saccadic availability of object features by presenting masks at varying delays. Independently of the availability of object features, target movement increased the rate of gaze-correcting secondary saccades to the original pre-saccadic target with a reduced saccade latency. Intra-saccadic motion was particularly effective in driving gaze correction when the target's stimulus features, in combination with the saccade trajectory, gave rise to efficient motion streaks. These results suggest that intra-saccadic visual information can facilitate the establishment of object correspondence and jump-start gaze correction. Copy rights belong to original authors. Visit the link for more info