ERIC Number: EJ1079460
Record Type: Journal
Publication Date: 2015-Oct
Abstractor: As Provided
Reference Count: N/A
Effects of Alphabet-Supplemented Speech on Brain Activity of Listeners: An fMRI Study
Fercho, Kelene; Baugh, Lee A.; Hanson, Elizabeth K.
Journal of Speech, Language, and Hearing Research, v58 n5 p1452-1463 Oct 2015
Purpose: The purpose of this article was to examine the neural mechanisms associated with increases in speech intelligibility brought about through alphabet supplementation. Method: Neurotypical participants listened to dysarthric speech while watching an accompanying video of a hand pointing to the 1st letter spoken of each word on an alphabet display (treatment condition) or a scrambled display (control condition). Their hemodynamic response was measured with functional magnetic resonance imaging, using a sparse sampling event-related paradigm. Speech intelligibility was assessed via a forced-choice auditory identification task throughout the scanning session. Results: Alphabet supplementation was associated with significant increases in speech intelligibility. Further, alphabet supplementation increased activation in brain regions known to be involved in both auditory speech and visual letter perception above that seen with the scrambled display. Significant increases in functional activity were observed within the posterior to mid superior temporal sulcus/superior temporal gyrus during alphabet supplementation, regions known to be involved in speech processing and audiovisual integration.
Descriptors: Alphabets, Speech, Brain, Listening Comprehension, Neurological Organization, Visual Perception, Auditory Perception
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A