Visuo-tactile links in covert exogenous spatial attention remap across changes in unseen hand posture.
We investigated the effect of unseen hand posture on cross-modal, visuo-tactile links in covert spatial attention. In Experiment 1, a spatially nonpredictive visual cue was presented to the left or right hemifield shortly before a tactile target on either hand. To examine the spatial coordinates of any cross-modal cuing, the unseen hands were either uncrossed or crossed so that the left hand lay to the right and vice versa. Tactile up/down (i.e., index finger/thumb) judgments were better on the same side of external space as the visual cue, for both crossed and uncrossed postures. Thus, which hand was advantaged by a visual cue in a particular hemifield reversed across the different unseen postures. In Experiment 2, nonpredictive tactile cues now preceded visual targets. Up/down judgments for the latter were better on the same side of external space as the tactile cue, again for both postures. These results demonstrate cross-modal links between vision and touch in exogenous covert spatial attention that remap across changes in unseen hand posture, suggesting a modulatory role for proprioception.
Kennett
Steffan
S
University of London, and Institute of Cognitive Neuroscience, University College London, London, England. s.kennett@ucl.ac.uk
Spence
Charles
C
Driver
Jon
J
D000293:Adolescent; D000328:Adult; D001288:Attention; D003463:Cues; D004192:Discrimination, Psychological; D005260:Female; D006225:Hand; D006801:Humans; D008297:Male; D011187:Posture; D013028:Space Perception; D014110:Touch; D014732:Vibration; D014796:Visual Perception