All talk? Challenging the use of left-temporal EEG alpha oscillations as valid measures of verbal processing and conscious motor control

Harrison, Neil (2020) All talk? Challenging the use of left-temporal EEG alpha oscillations as valid measures of verbal processing and conscious motor control. Biological Psychology. ISSN 0301-0511

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Abstract

This study tested the validity of EEG left-temporal alpha power and upper-alpha T7-Fz
connectivity as indices of verbal activity and conscious motor control. Participants (n = 20) reached
for, and transported, a jar under three conditions: a control condition and two self-talk conditions
aimed at eliciting either task-unrelated verbal processing or task-related conscious control, while EEG
and hand kinematics were recorded. Compared to the control condition, both self-talk conditions
increased self-reported verbal processing, but only the task-related self-talk condition increased lefttemporal
activity (i.e., alpha power decreased). However, as cortical activity increased across the
entire scalp topography, conscious control likely elicits a multitude of processes that may not be
explained by left-temporal activity or verbal processing alone, but by a widespread decrease in neural
efficiency. No significant effects for T7-Fz connectivity were detected. Results suggest that lefttemporal
EEG alpha oscillations are unlikely to uniquely reflect verbal processing during conscious
motor control.

Item Type: Article
Faculty / Department: Faculty of Science > Psychology
Depositing User: Neil Harrison
Date Deposited: 26 Oct 2020 14:57
Last Modified: 26 Oct 2020 14:57
URI: https://hira.hope.ac.uk/id/eprint/3164

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