Gamma activity modulated by naming of ambiguous and unambiguous images: intracranial recording.

ABSTRACT:

Objective

Humans sometimes need to recognize objects based on vague and ambiguous silhouettes. Recognition of such images may require an intuitive guess. We determined the spatial-temporal characteristics of intracranially-recorded gamma activity (at 50-120Hz) augmented differentially by naming of ambiguous and unambiguous images.

Methods

We studied 10 patients who underwent epilepsy surgery. Ambiguous and unambiguous images were presented during extraoperative electrocorticography recording, and patients were instructed to overtly name the object as it is first perceived.

Results

Both naming tasks were commonly associated with gamma-augmentation sequentially involving the occipital and occipital-temporal regions, bilaterally, within 200ms after the onset of image pre

SUBMITTER: Cho-Hisamoto Y 

PROVIDER: S-EPMC4201900 | biostudies-literature | 2015 Jan

REPOSITORIES: biostudies-literature