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Pre-Saccadic Shifts of Visual Attention
Authors:William J Harrison  Jason B Mattingley  Roger W Remington
Institution:1. The School of Psychology, The University of Queensland, St Lucia, Queensland, Australia.; 2. Queensland Brain Institute, The University of Queensland, St Lucia, Queensland, Australia.; University of California, Davis, United States of America,
Abstract:The locations of visual objects to which we attend are initially mapped in a retinotopic frame of reference. Because each saccade results in a shift of images on the retina, however, the retinotopic mapping of spatial attention must be updated around the time of each eye movement. Mathôt and Theeuwes 1] recently demonstrated that a visual cue draws attention not only to the cue''s current retinotopic location, but also to a location shifted in the direction of the saccade, the “future-field”. Here we asked whether retinotopic and future-field locations have special status, or whether cue-related attention benefits exist between these locations. We measured responses to targets that appeared either at the retinotopic or future-field location of a brief, non-predictive visual cue, or at various intermediate locations between them. Attentional cues facilitated performance at both the retinotopic and future-field locations for cued relative to uncued targets, as expected. Critically, this cueing effect also occurred at intermediate locations. Our results, and those reported previously 1], imply a systematic bias of attention in the direction of the saccade, independent of any predictive remapping of attention that compensates for retinal displacements of objects across saccades 2].
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