ZOOM!  VIRTUAL ONLY for October 19 Seminar

Seminars in Hearing Research

Date:   October 19, 2023

Zoom link: https://purdue-edu.zoom.us/j/4326340458 Meeting ID: 432 634 0458

Time:  12:00 - 1:00 pm

Speaker: Aditi Gargeshwari, Doctoral Candidate, Auditory Electrophysiology Lab, SLHS

Title: Influence of Visual Speech Cues on Auditory Subcortical and Cortical Responses in Normal and Impaired Ears.

Abstract: The human brain can integrate information from different sensory modalities to produce a unified representation of the external world. Temporally congruent auditory and visual stimulation facilitates multisensory perception and integration, allowing us to better process and understand the information presented to us, especially in the presence of background noise and for individuals with hearing difficulties. The influences of visual speech cues on behavioral speech perception are vastly studied. Functional magnetic resonance imaging and electrophysiological studies have mostly evaluated auditory cortical responses. Little is known about the influence of visual speech production cues on the auditory brainstem phase-locked ensemble responses in normal and individuals with sensorineural hearing loss. To address this knowledge gap, we evaluated the effects of congruent- and incongruent-audiovisual (AV) speech on scalp-recorded brainstem frequency following response (FFR) and the cortical acoustic change complex (ACC). For the FFR, both phase locking to envelope periodicity (FFRENV) and to the temporal fine structure (FFRTFS) were evaluated. I will present our initial results showing that visual speech cues do influence evoked responses at both cortical and brainstem levels, albeit differently. These results appear to suggest that neural activity relevant to audio-visual integration may be already emerging at the brainstem level. Thus, these measures have the potential to be developed as clinical metrics for evaluation of audio-visual integration, and as measures to evaluate hearing-aid outcomes and prognosis.

This year’s SHRP schedule is available here: https://purdue.edu/TPAN/hearing/shrp_schedule

Titles and abstracts of all SHRP talks are here: https://purdue.edu/TPAN/hearing/shrp_abstracts

Join Zoom Meeting:  https://purdue-edu.zoom.us/j/4326340458

Meeting ID: 432 634 0458

Christine Reidy

Senior Administrative Assistant, Bindley Bioscience Center

1203 Mitch Daniels Blvd., West Lafayette, IN 47907