scholarly journals Effects of Hearing Impairment on Listening Effort and Speech Intelligibility: A Systematic Review of Literature

2021 ◽  
2020 ◽  
Vol 31 (01) ◽  
pp. 017-029
Author(s):  
Paul Reinhart ◽  
Pavel Zahorik ◽  
Pamela Souza

AbstractDigital noise reduction (DNR) processing is used in hearing aids to enhance perception in noise by classifying and suppressing the noise acoustics. However, the efficacy of DNR processing is not known under reverberant conditions where the speech-in-noise acoustics are further degraded by reverberation.The purpose of this study was to investigate acoustic and perceptual effects of DNR processing across a range of reverberant conditions for individuals with hearing impairment.This study used an experimental design to investigate the effects of varying reverberation on speech-in-noise processed with DNR.Twenty-six listeners with mild-to-moderate sensorineural hearing impairment participated in the study.Speech stimuli were combined with unmodulated broadband noise at several signal-to-noise ratios (SNRs). A range of reverberant conditions with realistic parameters were simulated, as well as an anechoic control condition without reverberation. Reverberant speech-in-noise signals were processed using a spectral subtraction DNR simulation. Signals were acoustically analyzed using a phase inversion technique to quantify improvement in SNR as a result of DNR processing. Sentence intelligibility and subjective ratings of listening effort, speech naturalness, and background noise comfort were examined with and without DNR processing across the conditions.Improvement in SNR was greatest in the anechoic control condition and decreased as the ratio of direct to reverberant energy decreased. There was no significant effect of DNR processing on speech intelligibility in the anechoic control condition, but there was a significant decrease in speech intelligibility with DNR processing in all of the reverberant conditions. Subjectively, listeners reported greater listening effort and lower speech naturalness with DNR processing in some of the reverberant conditions. Listeners reported higher background noise comfort with DNR processing only in the anechoic control condition.Results suggest that reverberation affects DNR processing using a spectral subtraction algorithm in such a way that decreases the ability of DNR to reduce noise without distorting the speech acoustics. Overall, DNR processing may be most beneficial in environments with little reverberation and that the use of DNR processing in highly reverberant environments may actually produce adverse perceptual effects. Further research is warranted using commercial hearing aids in realistic reverberant environments.


2020 ◽  
Author(s):  
Bjorn Herrmann ◽  
Ingrid Johnsrude

Comprehension of speech masked by background sound requires increased cognitive processing, which makes listening effortful. Research in hearing has focused on such challenging listening experiences, in part because they are thought to contribute to social withdrawal in people with hearing impairment. Research has focused less on positive listening experiences, such as enjoyment and absorption/engagement, despite their potential importance in motivating effortful listening. Moreover, the artificial speech materials – such as disconnected, brief sentences – commonly utilized to investigate speech intelligibility and listening effort may be ill-suited to capture positive experiences when listening is challenging. Here, we investigate how listening to naturalistic spoken stories under acoustic challenges influences the quality of listening experiences. We show (1) that story absorption and enjoyment are only minimally affected by moderate speech masking although listening effort increases; (2) that familiarity with the Harry Potter books and/or movies, providing thematic knowledge, increases absorption and enjoyment and reduces listening effort when listening to the audio of a Harry-Potter summary presented in multi-talker babble; and (3) that absorption and enjoyment increase and effort decreases over time as individuals listen to several stories successively in multi-talker babble. Our research indicates that naturalistic, spoken stories can reveal several concurrent listening experiences and that familiarity with a narrative can increase engagement and reduce effort. Our work also demonstrates that, although listening effort may increase with speech degradation, listeners may still find the experience both absorbing and enjoyable.


2020 ◽  
Vol 24 ◽  
pp. 233121652096785
Author(s):  
Björn Herrmann ◽  
Ingrid S. Johnsrude

Comprehension of speech masked by background sound requires increased cognitive processing, which makes listening effortful. Research in hearing has focused on such challenging listening experiences, in part because they are thought to contribute to social withdrawal in people with hearing impairment. Research has focused less on positive listening experiences, such as enjoyment, despite their potential importance in motivating effortful listening. Moreover, the artificial speech materials—such as disconnected, brief sentences—commonly used to investigate speech intelligibility and listening effort may be ill-suited to capture positive experiences when listening is challenging. Here, we investigate how listening to naturalistic spoken stories under acoustic challenges influences the quality of listening experiences. We assess absorption (the feeling of being immersed/engaged in a story), enjoyment, and listening effort and show that (a) story absorption and enjoyment are only minimally affected by moderate speech masking although listening effort increases, (b) thematic knowledge increases absorption and enjoyment and reduces listening effort when listening to a story presented in multitalker babble, and (c) absorption and enjoyment increase and effort decreases over time as individuals listen to several stories successively in multitalker babble. Our research indicates that naturalistic, spoken stories can reveal several concurrent listening experiences and that expertise in a topic can increase engagement and reduce effort. Our work also demonstrates that, although listening effort may increase with speech masking, listeners may still find the experience both absorbing and enjoyable.


Author(s):  
Salvatore Grisanti ◽  
Vittorio D. Ferrari ◽  
Michela Buglione ◽  
Giorgio M. Agazzi ◽  
Roberto Liserre ◽  
...  

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