Induced gamma-band responses in the human EEG are related to attentional information processing
Synchronized neural activity in the frequency range above 20 Hz, the gamma-band, has been proposed as a signature of temporal feature binding. Here we suggest that selective attention facilitates synchronization
of neural activity. Selective attention can be guided by bottom-up, stimulus driven, or top-down task-driven processes. Both processes will cause that stimuli are processed preferentially. While bottom-up
processes might facilitate synchronization of neurons due to the salience of the stimulus, top-down processes may bias information selection by facilitating synchronization of neurons coding a certain location
in space and/or of neurons related to the processing of certain features. Animal as well as human EEG studies support the notion of a link between induced gamma-band responses and attentive, sensory stimulus
processing.
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