Spatiotemporal Dynamics of Covert Attention With Different Degrees of Central Visual Field Defects: An ERP and sLORETA Study.

ABSTRACT:

Purpose

The present study aimed to investigate the spatiotemporal dynamics of covert attention by simulating different degrees of central visual field defects in healthy subjects.

Methods

An electroencephalogram (EEG) was recorded while 40 normal-sighted subjects performed a target discrimination task. Target stimuli simulated different defect degrees of the central visual field by artificially central scotomas (5, 10, 20, and 30 degrees of visual angle) masked on the center of black-and-white checkerboards. Event-related potentials (ERPs) and standardized low-resolution brain electromagnetic tomography (sLORETA) based on ERPs were analyzed.

Results

ERP results indicated that during early perceptual processes, compared with 5-degree and 10-degree defects, N1 amplitude

SUBMITTER: Shi C 

PROVIDER: S-EPMC9055563 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature