1. Event related potentials (ERP) and behavioral measurements to verbal stimulation of visual fields.
- Author
-
Itzchak EB, Babkoff H, and Faust M
- Subjects
- Adolescent, Adult, Brain Mapping, Decision Making physiology, Dominance, Cerebral physiology, Event-Related Potentials, P300 physiology, Humans, Male, Orientation physiology, Reference Values, Semantics, Cerebral Cortex physiology, Electroencephalography, Evoked Potentials, Visual physiology, Pattern Recognition, Visual physiology, Reaction Time physiology, Reading, Visual Fields physiology
- Abstract
Event related potentials (ERP) to visually presented linguistic stimuli were examined using a lexical-decision task and an oddball paradigm. Stimuli were presented to the central, right or left visual fields (CVF, RVF and LVF) and generated ERP with very clear N100-P300 components. The question addressed was whether there is ERP evidence for left hemisphere (LH) superiority in linguistic discrimination as reported behaviorally. Nineteen young, right-handed male subjects participated. The main factor influencing the latency and amplitude of N100 was that of contralateral versus ipsilateral stimulation. Shorter N100 latency and larger amplitude were recorded over the hemisphere contralateral to the visual field stimulated. In contrast, the factors influencing the P300 parameters were the visual field stimulated and the hemisphere over which the ERP was recorded. P300 amplitude was significantly larger and P300 latency significantly shorter over the LH than over the RH. Significantly shorter P300 latency and larger peak amplitude were found for RVF than for LVF stimulation.
- Published
- 2007
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