Investigating the role of temporal lobe activation in speech perception accuracy with normal hearing adults

An event-related fNIRS study

Jessica Defenderfer, Anastasia Kerr-German, Mark Hedrick, Aaron T. Buss

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Functional near infrared spectroscopy (fNIRS) is a safe, non-invasive, relatively quiet imaging technique that is tolerant of movement artifact making it uniquely ideal for the assessment of hearing mechanisms. Previous research demonstrates the capacity for fNIRS to detect cortical changes to varying speech intelligibility, revealing a positive relationship between cortical activation amplitude and speech perception score. In the present study, we use an event-related design to investigate the hemodynamic response in the temporal lobe across different listening conditions. We presented participants with a speech recognition task using sentences in quiet, sentences in noise, and vocoded sentences. Hemodynamic responses were examined across conditions and then compared when speech perception was accurate compared to when speech perception was inaccurate in the context of noisy speech. Repeated measures, two-way ANOVAs revealed that the speech in noise condition (−2.8 dB signal-to-noise ratio/SNR) demonstrated significantly greater activation than the easier listening conditions on multiple channels bilaterally. Further analyses comparing correct recognition trials to incorrect recognition trials (during the presentation phase of the trial) revealed that activation was significantly greater during correct trials. Lastly, during the repetition phase of the trial, where participants correctly repeated the sentence, the hemodynamic response demonstrated significantly higher deoxyhemoglobin than oxyhemoglobin, indicating a difference between the effects of perception and production on the cortical response. Using fNIRS, the present study adds meaningful evidence to the body of knowledge that describes the brain/behavior relationship related to speech perception.

Original languageEnglish (US)
Pages (from-to)31-41
Number of pages11
JournalNeuropsychologia
Volume106
DOIs
StatePublished - Nov 1 2017
Externally publishedYes

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Speech Perception
Near-Infrared Spectroscopy
Temporal Lobe
Hearing
Hemodynamics
Noise
Speech Intelligibility
Oxyhemoglobins
Signal-To-Noise Ratio
Artifacts
Analysis of Variance
Brain
Research
Recognition (Psychology)

All Science Journal Classification (ASJC) codes

  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience
  • Behavioral Neuroscience

Cite this

Investigating the role of temporal lobe activation in speech perception accuracy with normal hearing adults : An event-related fNIRS study. / Defenderfer, Jessica; Kerr-German, Anastasia; Hedrick, Mark; Buss, Aaron T.

In: Neuropsychologia, Vol. 106, 01.11.2017, p. 31-41.

Research output: Contribution to journalArticle

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