Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2019 Dec;199:104700.
doi: 10.1016/j.bandl.2019.104700. Epub 2019 Oct 3.

Top-down and Bottom-Up Mechanisms as Reflected by Beta and Gamma Oscillations in Speech Perception: An Individual-Difference Approach

Affiliations

Top-down and Bottom-Up Mechanisms as Reflected by Beta and Gamma Oscillations in Speech Perception: An Individual-Difference Approach

Jinghua Ou et al. Brain Lang. .

Abstract

Recent neurophysiological studies have proposed distinct roles of β and γ oscillations in implementing top-down and bottom-up processes. The present study aims to test this hypothesis in the domain of speech perception. We examined β and γ oscillations elicited to a tone contrast in a passive oddball paradigm, and their relationships with discrimination sensitivity d' and RT from two groups of healthy adults who showed high and low discrimination sensitivity to the contrast. The low-sensitivity group showed a significant reduction in β, which was further related to d'. Individual differences in RT were related to different frequency bands in the two groups, with a RT-β correlation in the low-sensitivity group, and a RT-γ relation in the high-sensitivity group. Based on these findings, we suggest that β, implicated in top-down processing, reflects individual differences in phonological representations, and that γ, involved in bottom-up processing, reflects individual differences in acoustic encoding.

Keywords: Beta oscillation; EEG; Gamma oscillation; Speech perception.

Similar articles

See all similar articles

Publication types

LinkOut - more resources

Feedback