High-frequency gamma activity (80-150Hz) is increased in human cortex during selective attention.

ABSTRACT:

Objective

To study the role of gamma oscillations (>30Hz) in selective attention using subdural electrocorticography (ECoG) in humans.

Methods

We recorded ECoG in human subjects implanted with subdural electrodes for epilepsy surgery. Sequences of auditory tones and tactile vibrations of 800 ms duration were presented asynchronously, and subjects were asked to selectively attend to one of the two stimulus modalities in order to detect an amplitude increase at 400 ms in some of the stimuli.

Results

Event-related ECoG gamma activity was greater over auditory cortex when subjects attended auditory stimuli and was greater over somatosensory cortex when subjects attended vibrotactile stimuli. Furthermore, gamma activity was also observed over prefrontal cortex when stimuli

SUBMITTER: Ray S 

PROVIDER: S-EPMC2444052 | biostudies-literature | 2008 Jan

REPOSITORIES: biostudies-literature