TY  - JOUR
PY  - 2011//
TI  - Electrophysiological correlates of inter- and intrahemispheric saccade-related updating of visual space
JO  - Behavioural brain research
A1  - Peterburs, Jutta
A1  - Gajda, Kathrin
A1  - Hoffmann, Klaus-Peter
A1  - Daum, Irene
A1  - Bellebaum, Christian
SP  - 496
EP  - 504
VL  - 216
IS  - 2
N2  - The process of spatial updating is crucial for maintaining perceptual stability despite gross and frequent displacements of space following saccadic eye movements. Efference copies of motor commands are used to update retinal coordinates across saccades. The present study investigated neural correlates of saccadic updating in a perceptual context with regard to temporal dynamics and modulation by intra- versus interhemispheric transfer of updating-related information. Twenty-two subjects engaged in a perceptual localization task which required trans-saccadic spatial updating while event-related potentials (ERPs) were recorded. In accordance with previous studies, post-saccadic perceptual localization of stimuli presented before a saccade was less accurate when relying on efference copy signals (i.e. updating was required) as compared to a control condition not involving updating. Updating-related ERP components emerged before and after saccade onset. There was no clear transfer-dependent modulation of the presaccadic component. A negative deflection between 30 and 70ms after saccade onset was most pronounced for rightward saccades, and when intrahemispheric transfer was required. A slower positive deflection starting about 170 to 230ms after saccade onset had a shorter latency for leftward than for rightward saccades and was not modulated by transfer. In accordance with previous work, this relative positivity is thought to reflect sensory memory, whereas the earlier negative deflection can be more directly linked to the updating process itself.<p />  <p>Language: en</p>
LA  - en
SN  - 0166-4328
UR  - http://dx.doi.org/10.1016/j.bbr.2010.08.025
ID  - ref1
ER  -