High-frequency activity in human visual cortex is modulated by visual motion strength.
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High-frequency activity in human visual cortex is modulated by visual motion strength. / Siegel, Markus; Donner, Tobias H; Oostenveld, Robert; Fries, Pascal; Engel, Andreas K.
in: CEREB CORTEX, Jahrgang 17, Nr. 3, 3, 2007, S. 732-741.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - High-frequency activity in human visual cortex is modulated by visual motion strength.
AU - Siegel, Markus
AU - Donner, Tobias H
AU - Oostenveld, Robert
AU - Fries, Pascal
AU - Engel, Andreas K.
PY - 2007
Y1 - 2007
N2 - A central goal in systems neuroscience is to understand how the brain encodes the intensity of sensory features. We used whole-head magnetoencephalography to investigate whether frequency-specific neuronal activity in the human visual cortex is systematically modulated by the intensity of an elementary sensory feature such as visual motion. Visual stimulation induced a tonic increase of neuronal activity at frequencies above 50 Hz. In order to define a functional frequency band of neuronal activity, we parametrically investigated which frequency band displays the strongest monotonic increase of responses with strength of visual motion. Consistently in all investigated subjects, this analysis resulted in a functional frequency band in the high gamma range from about 60 to 100 Hz in which activity reliably increased with visual motion strength. Using distributed source reconstruction, we found that this increase of high-frequency neuronal activity originates from several extrastriate cortical regions specialized in motion processing. We conclude that high-frequency activity in the human visual motion pathway may be relevant for encoding the intensity of visual motion signals.
AB - A central goal in systems neuroscience is to understand how the brain encodes the intensity of sensory features. We used whole-head magnetoencephalography to investigate whether frequency-specific neuronal activity in the human visual cortex is systematically modulated by the intensity of an elementary sensory feature such as visual motion. Visual stimulation induced a tonic increase of neuronal activity at frequencies above 50 Hz. In order to define a functional frequency band of neuronal activity, we parametrically investigated which frequency band displays the strongest monotonic increase of responses with strength of visual motion. Consistently in all investigated subjects, this analysis resulted in a functional frequency band in the high gamma range from about 60 to 100 Hz in which activity reliably increased with visual motion strength. Using distributed source reconstruction, we found that this increase of high-frequency neuronal activity originates from several extrastriate cortical regions specialized in motion processing. We conclude that high-frequency activity in the human visual motion pathway may be relevant for encoding the intensity of visual motion signals.
M3 - SCORING: Zeitschriftenaufsatz
VL - 17
SP - 732
EP - 741
JO - CEREB CORTEX
JF - CEREB CORTEX
SN - 1047-3211
IS - 3
M1 - 3
ER -
