Opposite dependencies on visual motion coherence in human area MT+ and early visual cortex. Export

@article{citeulike:831973, abstract = {In order to understand the relationship between brain activity and visual motion perception, knowledge of the cortical areas participating in signal processing alone is insufficient. Rather knowledge on how responses vary with the characteristics of visual motion is necessary. In this study, we measured whole brain activity using magnetoencephalography in humans discriminating the global motion direction of a random dot kinematogram whose strength was systematically varied by the percentage of coherently moving dot elements. Spectral analysis revealed 2 components correlating with motion coherence. A first component in the low-frequency domain ( approximately 3 Hz), linearly increasing with motion coherence, could be attributed to visual cortex including human area middle temporal (MT) +. A second component oscillating in the alpha frequency range and emerging after stimulus offset showed the inverse dependence on motion coherence and arose from early visual cortex. Based on these results, we first of all conclude that motion coherence is reflected in the population response of human extrastriate cortex. Second, we suggest that the occipital alpha activity represents a gating mechanism protecting visual motion integration in later cortical areas from disturbing upcoming signals.}, address = {Department of General Neurology, University of T\"{u}bingen, 72076 T\"{u}bingen, Germany; Department of Cognitive Neurology, Hertie-Institute for Clinical Brain Research, University of T\"{u}bingen, 72076 T\"{u}bingen, Germany.}, author = {H\"{a}ndel, Barbara and Lutzenberger, Werner and Thier, Peter and Haarmeier, Thomas}, citeulike-article-id = {831973}, citeulike-linkout-0 = {http://view.ncbi.nlm.nih.gov/pubmed/16940034}, citeulike-linkout-1 = {http://www.hubmed.org/display.cgi?uids=16940034}, day = {28}, issn = {1047-3211}, journal = {Cerebral Cortex}, keywords = {alpha, gamma, meg, motion}, month = {August}, posted-at = {2009-05-27 01:53:49}, priority = {2}, title = {Opposite dependencies on visual motion coherence in human area MT+ and early visual cortex.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/16940034}, year = {2006} }

TY - JOUR ID - citeulike:831973 L3 - citeulike-article-id:831973 N2 - In order to understand the relationship between brain activity and visual motion perception, knowledge of the cortical areas participating in signal processing alone is insufficient. Rather knowledge on how responses vary with the characteristics of visual motion is necessary. In this study, we measured whole brain activity using magnetoencephalography in humans discriminating the global motion direction of a random dot kinematogram whose strength was systematically varied by the percentage of coherently moving dot elements. Spectral analysis revealed 2 components correlating with motion coherence. A first component in the low-frequency domain ( approximately 3 Hz), linearly increasing with motion coherence, could be attributed to visual cortex including human area middle temporal (MT) +. A second component oscillating in the alpha frequency range and emerging after stimulus offset showed the inverse dependence on motion coherence and arose from early visual cortex. Based on these results, we first of all conclude that motion coherence is reflected in the population response of human extrastriate cortex. Second, we suggest that the occipital alpha activity represents a gating mechanism protecting visual motion integration in later cortical areas from disturbing upcoming signals. JF - Cerebral Cortex SN - 1047-3211 AD - Department of General Neurology, University of Tübingen, 72076 Tübingen, Germany; Department of Cognitive Neurology, Hertie-Institute for Clinical Brain Research, University of Tübingen, 72076 Tübingen, Germany. TI - Opposite dependencies on visual motion coherence in human area MT+ and early visual cortex. KW - alpha KW - gamma KW - meg KW - motion AU - Händel, Barbara AU - Lutzenberger, Werner AU - Thier, Peter AU - Haarmeier, Thomas PY - 2006/08/28/ UR - http://view.ncbi.nlm.nih.gov/pubmed/16940034 ER -