Subjective and Psychophysiological Indexes of Listening Effort in a Competing-Talker Task.
Background: The effects of noise and other competing backgrounds on speech recognition performance are well documented. There is less information, however, on listening effort and stress experienced by listeners during a speech-recognition task that requires inhibition of competing sounds. Purpose:...
| Publicado en: | Journal of the American Academy of Audiology Vol. 22; no. 2; pp. 113 - 123 |
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| Autores principales: | , |
| Formato: | research tables/charts Journal Article |
| Publicado: |
Thieme Medical Publishing Inc.
Feb2011
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104886170&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104886170 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 10500545 9OC jtl: Journal of the American Academy of Audiology issn: 10500545 maglogo: Y pubinfo: dt: Feb2011 vid: 22 iid: 2 pid: 2811 pub: Thieme Medical Publishing Inc. place: New York, New York artinfo: ui: 104886170 60310003 10.3766/jaaa.22.2.6 NLM21463566 104886170 ppf: 113 ppct: 10 formats: fmt: @attributes: type: P tig: atl: Subjective and Psychophysiological Indexes of Listening Effort in a Competing-Talker Task. aug: au: Mackersie, Carol L. Cones, Heather affil: School of Speech, Language and Hearing Sciences, San Diego State University sug: subj: Noise Speech Perception Listening Evaluation Human Psychophysiology Evaluation Experimental Studies Repeated Measures Adult Middle Age Male Female Electromyography Analysis of Variance Adult: 19-44 years Middle Aged: 45-64 years Male Female ab: Background: The effects of noise and other competing backgrounds on speech recognition performance are well documented. There is less information, however, on listening effort and stress experienced by listeners during a speech-recognition task that requires inhibition of competing sounds. Purpose: The purpose was (a) to determine if psychophysiological indexes of listening effort were more sensitive than performance measures (percentage correct) obtained near ceiling level during a competing speech task, (b) to determine the relative sensitivity of four psychophysiological measures to changes in task demand, and (c) to determine the relationships between changes in psychophysiological measures and changes in subjective ratings of stress and workload. Research Design: A repeated-measures experimental design was used to examine changes in performance, psychophysiological measures, and subjective ratings in response to increasing task demand. Study Sample: Fifteen adults with normal hearing participated in the study. The mean age of the participants was 27 (range: 24-54). Data Collection and Analysis: Psychophysiological recordings of heart rate, skin conductance, skin temperature, and electromyographic (EMG) activity were obtained during listening tasks of varying demand. Materials from the Dichotic Digits Test were used to modulate task demand. The three levels of task demand were single digits presented to one ear (low-demand reference condition), single digits presented simultaneously to both ears (medium demand), and a series of two digits presented simultaneously to both ears (high demand). Participants were asked to repeat all the digits they heard, while psychophysiological activity was recorded simultaneously. Subjective ratings of task load were obtained after each condition using the National Aeronautics and Space Administration Task Load Index questionnaire. Repeated-measures analyses of variance were completed for each measure using task demand and session as factors. Results: Mean performance was higher than 96% for all listening tasks. There was no significant change in performance across listening conditions for any listener. There was, however, a significant increase in mean skin conductance and EMG activity as task demand increased. Heart rate and skin temperature did not change significantly. There was no strong association between subjective and psychophysiological measures, but all participants with mean normalized effort ratings of greater than 4.5 (i.e., effort increased by a factor of at least 4.5) showed significant changes in skin conductance. Conclusions: Even in the absence of substantial performance changes, listeners may experience changes in subjective and psychophysiological responses consistent with the activation of a stress response. Skin conductance appears to be the most promising measure for evaluating individual changes in psychophysiological responses during listening tasks. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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