Visual receptive field modulation in the lateral intraparietal area during attentive fixation and free gaze. Export

@article{citeulike:302712, abstract = {The receptive field (RF) of neurons recorded from the lateral intraparietal area (LIP) was quantified using a rapid, computer-driven mapping procedure. For each neuron, the RF was mapped: (1) during attentive fixation and (2) during free visual exploration. RF location, size and internal structure were modulated by the mapping context in over two-thirds of the recorded neurons. The major trend was a proportionally larger amount of neuronal visual resources allocated to central space during fixation, and an attenuated center-to-periphery gradient in the visual field representation during free gaze. A population approach shows that these spatial modulations are accompanied by changes in the signal-to-noise ratio of the information carried in the RF substructure. We related these neurophysiological observations to behavior, by comparing the characteristics of saccades elicited during fixation and free gaze. Together, the results suggest that the dynamics of LIP visual RFs may characterize both the state of engagement of attention and the power of resolution of visual analysis: during fixation, the neural population is locked in a filter state concentrating the processing resources at the fovea, while during free gaze, the population shifts to a detector state spreading the resources more evenly across the visual field.}, address = {Institut des Sciences Cognitives, CNRS, 67 boulevard Pinel, F-69675 Bron, France.}, author = {Ben Hamed, S. and Duhamel, J. R. and Bremmer, F. and Graf, W.}, citeulike-article-id = {302712}, citeulike-linkout-0 = {http://view.ncbi.nlm.nih.gov/pubmed/11839598}, citeulike-linkout-1 = {http://www.hubmed.org/display.cgi?uids=11839598}, issn = {1047-3211}, journal = {Cereb Cortex}, keywords = {freeviewing, lip, monkey, neurophysiology}, month = {March}, number = {3}, pages = {234--245}, posted-at = {2005-08-24 17:40:21}, priority = {2}, title = {Visual receptive field modulation in the lateral intraparietal area during attentive fixation and free gaze.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/11839598}, volume = {12}, year = {2002} }

TY - JOUR ID - citeulike:302712 L3 - citeulike-article-id:302712 N2 - The receptive field (RF) of neurons recorded from the lateral intraparietal area (LIP) was quantified using a rapid, computer-driven mapping procedure. For each neuron, the RF was mapped: (1) during attentive fixation and (2) during free visual exploration. RF location, size and internal structure were modulated by the mapping context in over two-thirds of the recorded neurons. The major trend was a proportionally larger amount of neuronal visual resources allocated to central space during fixation, and an attenuated center-to-periphery gradient in the visual field representation during free gaze. A population approach shows that these spatial modulations are accompanied by changes in the signal-to-noise ratio of the information carried in the RF substructure. We related these neurophysiological observations to behavior, by comparing the characteristics of saccades elicited during fixation and free gaze. Together, the results suggest that the dynamics of LIP visual RFs may characterize both the state of engagement of attention and the power of resolution of visual analysis: during fixation, the neural population is locked in a filter state concentrating the processing resources at the fovea, while during free gaze, the population shifts to a detector state spreading the resources more evenly across the visual field. IS - 3 JF - Cereb Cortex SN - 1047-3211 AD - Institut des Sciences Cognitives, CNRS, 67 boulevard Pinel, F-69675 Bron, France. EP - 245 TI - Visual receptive field modulation in the lateral intraparietal area during attentive fixation and free gaze. VL - 12 SP - 234 KW - freeviewing KW - lip KW - monkey KW - neurophysiology AU - Ben Hamed, S AU - Duhamel, JR AU - Bremmer, F AU - Graf, W PY - 2002/03// UR - http://view.ncbi.nlm.nih.gov/pubmed/11839598 ER -