The spectral properties of induced and evoked gamma oscillations in human early visual cortex to moving and stationary stimuli. Export

@article{citeulike:5057718, abstract = {In two experiments, magnetoencephalography (MEG) was used to investigate the effects of motion on gamma oscillations in human early visual cortex. When presented centrally, but not peripherally, stationary and moving gratings elicited several evoked and induced response components in early visual cortex. Time-frequency analysis revealed two non-phase locked gamma power increases - an initial, rapidly adapting response and one sustained throughout stimulus presentation and varying in frequency across observers from 28 to 64 Hz. Stimulus motion raised the sustained gamma oscillation frequency by a mean of approximately 10 Hz. The largest motion-induced frequency increases were in those observers with the lowest gamma response frequencies for stationary stimuli, suggesting a possible saturation mechanism. Moderate gamma amplitude increases to moving versus stationary stimuli were also observed, but were not correlated with the magnitude of the frequency increase. At the same site in visual cortex, sustained alpha/beta power reductions and an onset evoked response were observed but these effects did not change significantly with the presence of motion and did not correlate with the magnitude of gamma power changes. These findings suggest that early visual areas encode moving and stationary percepts via activity at higher and lower gamma frequencies respectively.}, author = {Swettenham, Jennifer B. and Muthukumaraswamy, Suresh D. and Singh, Krish D.}, citeulike-article-id = {5057718}, citeulike-linkout-0 = {http://dx.doi.org/10.1152/jn.91044.2008}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/19515947}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=19515947}, doi = {10.1152/jn.91044.2008}, issn = {0022-3077}, journal = {Journal of neurophysiology}, keywords = {human, meg, oscillation, vision}, month = {June}, posted-at = {2009-07-04 20:35:30}, priority = {2}, title = {The spectral properties of induced and evoked gamma oscillations in human early visual cortex to moving and stationary stimuli.}, url = {http://dx.doi.org/10.1152/jn.91044.2008}, year = {2009} }

TY - JOUR ID - citeulike:5057718 L3 - citeulike-article-id:5057718 N2 - In two experiments, magnetoencephalography (MEG) was used to investigate the effects of motion on gamma oscillations in human early visual cortex. When presented centrally, but not peripherally, stationary and moving gratings elicited several evoked and induced response components in early visual cortex. Time-frequency analysis revealed two non-phase locked gamma power increases - an initial, rapidly adapting response and one sustained throughout stimulus presentation and varying in frequency across observers from 28 to 64 Hz. Stimulus motion raised the sustained gamma oscillation frequency by a mean of approximately 10 Hz. The largest motion-induced frequency increases were in those observers with the lowest gamma response frequencies for stationary stimuli, suggesting a possible saturation mechanism. Moderate gamma amplitude increases to moving versus stationary stimuli were also observed, but were not correlated with the magnitude of the frequency increase. At the same site in visual cortex, sustained alpha/beta power reductions and an onset evoked response were observed but these effects did not change significantly with the presence of motion and did not correlate with the magnitude of gamma power changes. These findings suggest that early visual areas encode moving and stationary percepts via activity at higher and lower gamma frequencies respectively. JF - Journal of neurophysiology SN - 0022-3077 TI - The spectral properties of induced and evoked gamma oscillations in human early visual cortex to moving and stationary stimuli. KW - human KW - meg KW - oscillation KW - vision AU - Swettenham, Jennifer AU - Muthukumaraswamy, Suresh AU - Singh, Krish PY - 2009/06/10/ UR - http://dx.doi.org/10.1152/jn.91044.2008 ER -