Cortical evoked potentials elicited by real speech words and human sounds

Electroencephalography and Clinical Neurophysiology
D FriedmanI Rapin

Abstract

Averaged evoked potentials were recorded from PZ and left and right temporo-parietal electodes to real speech words and human sounds in 8 right-handed subjects. Stimuli were presented in a "no task" condition where the subject was instructed to listen attentively, and a vigilance condition where the subject responded to a particular word or sound during a run of such stimuli. The vigilance condition produced two classes of stimuli:signals and non-signals. Evoked potentials to physically identical words or sounds were examined when they were "no task", non-signal and signal stimuli. P300 amplitude increased significantly as a function of increasing task demands going from "no task" to non-signal to signal. When a strict statistical criterion for multiple comparisons (Bonferroni test) was applied in looking for asymmetries between hemispheres, only 2 isolated left greater than right differences turned out to be significant. Review of the literature concerning evoked potential correlates of differential hemispheric processing pointed up flaws in design, statistical technique, and inconsistencies in reported findings which suggested that while evoked potentials may sometimes reflect differences in hemispheric functioning, this effe...Continue Reading

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Related Concepts

Auditory Perception
Functional Cerebral Localization
Insula of Reil
Hemispheric Specialization
Potentials, Event-Related
Ambidexterity
Parietal Lobe
Reaction Time
Sound Waves
Public Speaking

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