Gamma Activity Modulated by Naming of Ambiguous and Unambiguous Images: Intracranial Recording

Overview

Journal Clin Neurophysiol

Publisher Elsevier

Specialties Neurology
Psychiatry

Date 2014 May 13

PMID 24815577

Citations 8

Authors

Yoshimi Cho-Hisamoto

Katsuaki Kojima

Erik C Brown

Naoyuki Matsuzaki

Eishi Asano

Affiliations

Soon will be listed here.

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 presentation. Naming of ambiguous images elicited gamma-augmentation specifically involving portions of the inferior-frontal, orbitofrontal, and inferior-parietal regions at 400ms and after. Unambiguous images were associated with more intense gamma-augmentation in portions of the occipital and occipital-temporal regions.

Conclusions: Frontal-parietal gamma-augmentation specific to ambiguous images may reflect the additional cortical processing involved in exerting intuitive guess. Occipital gamma-augmentation enhanced during naming of unambiguous images can be explained by visual processing of stimuli with richer detail.

Significance: Our results support the theoretical model that guessing processes in visual domain occur following the accumulation of sensory evidence resulting from the bottom-up processing in the occipital-temporal visual pathways.

Citing Articles

Sonoda M, Rothermel R, Carlson A, Jeong J, Lee M, Hayashi T Brain. 2022; 145(2):517-530.

PMID: 35313351 PMC: 9014727. DOI: 10.1093/brain/awab318.

Significance of event related causality (ERC) in eloquent neural networks.

Korzeniewska A, Mitsuhashi T, Wang Y, Asano E, Franaszczuk P, Crone N Neural Netw. 2022; 149:204-216.

PMID: 35248810 PMC: 9029701. DOI: 10.1016/j.neunet.2022.02.002.

Left Prefrontal Cortex Supports the Recognition of Meaningful Patterns in Ambiguous Stimuli.

Bartel G, Marko M, Rameses I, Lamm C, Riecansky I Front Neurosci. 2020; 14:152.

PMID: 32153364 PMC: 7050495. DOI: 10.3389/fnins.2020.00152.

Four-dimensional functional cortical maps of visual and auditory language: Intracranial recording.

Nakai Y, Sugiura A, Brown E, Sonoda M, Jeong J, Rothermel R Epilepsia. 2019; 60(2):255-267.

PMID: 30710356 PMC: 6365188. DOI: 10.1111/epi.14648.

Presurgical language mapping using event-related high-gamma activity: The Detroit procedure.

Kambara T, Sood S, Alqatan Z, Klingert C, Ratnam D, Hayakawa A Clin Neurophysiol. 2017; 129(1):145-154.

PMID: 29190521 PMC: 5744878. DOI: 10.1016/j.clinph.2017.10.018.

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