Comparing spatial tuning curves, spectral ripple resolution, and speech perception in cochlear implant users

Anderson, Elizabeth; Nelson, David A.; Kreft, Heather A.; Nelson, Peggy B.; Oxenham, Andrew J.

doi:10.1121/1.3589255

Cited by 94 publications

(125 citation statements)

References 26 publications

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“…Another measure of spectral resolution uses broadband spectral ripple discrimination, where listeners have to discriminate between a spectral ripple pattern and its inverse-phase counterpart. With this method, Anderson et al (2011) showed that, on average, CI listeners could discriminate phase-inverted spectral ripples up to 1.68 ripple/ octave. The detection of the 3.6-semitone shift in our experiment would require discrimination of 1.67 ripple/octave, so average CI listeners could perhaps just detect this VTL shift.…”

Section: Gender Categorization By CI Listenersmentioning

confidence: 99%

Gender Categorization Is Abnormal in Cochlear Implant Users

Fuller¹,

Gaudrain²,

Clarke³

et al. 2014

JARO

112

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In normal hearing (NH), the perception of the gender of a speaker is strongly affected by two anatomically related vocal characteristics: the fundamental frequency (F0), related to vocal pitch, and the vocal tract length (VTL), related to the height of the speaker. Previous studies on gender categorization in cochlear implant (CI) users found that performance was variable, with few CI users performing at the level of NH listeners. Data collected with recorded speech produced by multiple talkers suggests that CI users might rely more on F0 and less on VTL than NH listeners. However, because VTL cannot be accurately estimated from recordings, it is difficult to know how VTL contributes to gender categorization. In the present study, speech was synthesized to systematically vary F0, VTL, or both. Gender categorization was measured in CI users, as well as in NH participants listening to unprocessed (only synthesized) and vocoded (and synthesized) speech. Perceptual weights for F0 and VTL were derived from the performance data. With unprocessed speech, NH listeners used both cues (normalized perceptual weight: F0=3.76, VTL=5.56). With vocoded speech, NH listeners still made use of both cues but less efficiently (normalized perceptual weight: F0=1.68, VTL=0.63). CI users relied almost exclusively on F0 while VTL perception was profoundly impaired (normalized perceptual weight: F0=6.88, VTL=0.59). As a result, CI users' gender categorization was abnormal compared to NH listeners. Future CI signal processing should aim to improve the transmission of both F0 cues and VTL cues, as a normal gender categorization may benefit speech understanding in competing talker situations.

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Section: Gender Categorization By CI Listenersmentioning

confidence: 99%

Gender Categorization Is Abnormal in Cochlear Implant Users

Fuller¹,

Gaudrain²,

Clarke³

et al. 2014

JARO

112

View full text Add to dashboard Cite

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“…One psychophysical task that is believed to measure spectral resolution is spectral ripple discrimination (Supin et al, 1994;Henry et al, 2005;Won et al, 2007;Anderson et al, 2011). For this procedure, the listener is required to discriminate between a spectrally rippled noise stimulus (i.e., broadband noise containing regular variations in amplitude along the frequency axis) and another stimulus in which the positions of spectral peaks and valleys are reversed.…”

Section: Introductionmentioning

confidence: 99%

“…Typically, the spectral modulation depth is held constant and the ripple rate is adaptively varied to find the listener's ripple discrimination threshold. Spectral ripple discrimination has been shown to correlate with other measures of spectral resolution in cochlear-implant (CI) users, such as spatial tuning curves (Anderson et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Spectral ripple detection thresholds were measured over a range of ripple rates for a group of CI subjects and compared to the spectral ripple discrimination thresholds previously obtained from the same subjects (Anderson et al, 2011). It was predicted that if both measures reflect spectral resolution, then the individual results in the two tasks should be related in a lawful manner.…”

Section: Introductionmentioning

confidence: 99%

“…It was predicted that if both measures reflect spectral resolution, then the individual results in the two tasks should be related in a lawful manner. In addition, spectral ripple detection thresholds were compared to speech-perception measures from the same subjects, reported in Anderson et al (2011), to test whether the earlier findings showing a relationship between detection of broadly spaced ripples and measures of speech recognition (Litvak et al, 2007;Saoji et al, 2009) could be replicated.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessing the role of spectral and intensity cues in spectral ripple detection and discrimination in cochlear-implant users

Anderson¹,

Oxenham

Nelson³

et al. 2012

The Journal of the Acoustical Society of America

Self Cite

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Measures of spectral ripple resolution have become widely used psychophysical tools for assessing spectral resolution in cochlear-implant (CI) listeners. The objective of this study was to compare spectral ripple discrimination and detection in the same group of CI listeners. Ripple detection thresholds were measured over a range of ripple frequencies and were compared to spectral ripple discrimination thresholds previously obtained from the same CI listeners. The data showed that performance on the two measures was correlated, but that individual subjects' thresholds (at a constant spectral modulation depth) for the two tasks were not equivalent. In addition, spectral ripple detection was often found to be possible at higher rates than expected based on the available spectral cues, making it likely that temporal-envelope cues played a role at higher ripple rates. Finally, spectral ripple detection thresholds were compared to previously obtained speech-perception measures. Results confirmed earlier reports of a robust relationship between detection of widely spaced ripples and measures of speech recognition. In contrast, intensity difference limens for broadband noise did not correlate with spectral ripple detection measures, suggesting a dissociation between the ability to detect small changes in intensity across frequency and across time.

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Speech-evoked cortical activities and speech recognition in adult cochlear implant listeners: a review of functional near-infrared spectroscopy studies

Farrar,

Ashjaei,

Arjmandi

2024

Exp Brain Res

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Cochlear implants (CIs) are the most successful neural prostheses, enabling individuals with severe to profound hearing loss to access sounds and understand speech. While CI has demonstrated success, speech perception outcomes vary largely among CI listeners, with significantly reduced performance in noise. This review paper summarizes prior findings on speech-evoked cortical activities in adult CI listeners using functional near-infrared spectroscopy (fNIRS) to understand (a) speech-evoked cortical processing in CI listeners compared to normal-hearing (NH) individuals, (b) the relationship between these activities and behavioral speech recognition scores, (c) the extent to which current fNIRS-measured speech-evoked cortical activities in CI listeners account for their differences in speech perception, and (d) challenges in using fNIRS for CI research. Compared to NH listeners, CI listeners had diminished speech-evoked activation in the middle temporal gyrus (MTG) and in the superior temporal gyrus (STG), except one study reporting an opposite pattern for STG. NH listeners exhibited higher inferior frontal gyrus (IFG) activity when listening to CI-simulated speech compared to natural speech. Among CI listeners, higher speech recognition scores correlated with lower speech-evoked activation in the STG, higher activation in the left IFG and left fusiform gyrus, with mixed findings in the MTG. fNIRS shows promise for enhancing our understanding of cortical processing of speech in CI listeners, though findings are mixed. Challenges include test-retest reliability, managing noise, replicating natural conditions, optimizing montage design, and standardizing methods to establish a strong predictive relationship between fNIRS-based cortical activities and speech perception in CI listeners.

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Comparing spatial tuning curves, spectral ripple resolution, and speech perception in cochlear implant users

Cited by 94 publications

References 26 publications

Gender Categorization Is Abnormal in Cochlear Implant Users

Gender Categorization Is Abnormal in Cochlear Implant Users

Assessing the role of spectral and intensity cues in spectral ripple detection and discrimination in cochlear-implant users

Speech-evoked cortical activities and speech recognition in adult cochlear implant listeners: a review of functional near-infrared spectroscopy studies

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