Schwarzbach J V, Lingnau A, Melcher D P, 2010, "Spatial specificity of the remapped BOLD response across saccades" Perception 39 ECVP Abstract Supplement, page 55
Spatial specificity of the remapped BOLD response across saccades
J V Schwarzbach, A Lingnau, D P Melcher
Around the time of saccadic eye movements, many oculomotor and visual areas dynamically ‘remap’ their receptive fields. Remapping across hemispheres has been studied with fMRI by having participants make horizontal saccades so that stimuli switch hemispheres across saccades. Even when the stimulus is extinguished immediately prior to the saccade, increased BOLD has been found in areas ipsilateral to the original stimulus location. However, previous studies have not shown whether this putative correlate of remapping is stimulus- and location-specific or just an unspecific increase in ipsilateral activity such as a change in gain fields or connectivity. We tested spatial specificity by presenting the remapped stimulus either above or below the midline. We looked for spatial selectivity using a GLM conjunction-analysis that identified voxels showing stronger contralateral activation for stimuli presented above versus below midline during trials where no saccade was made AND stronger ipsilateral activation for stimuli presented above versus below midline during trials where a saccade was made. Using this approach, we identified regions in V2/V3 that showed spatially specific remapping. Spatial selectivity was much weaker after remapping, which is incompatible with a pure ‘cut & paste’ account of achieving visual stability across eye movements.
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