scholarly journals Discrimination of Speech Sound Contrasts Determined with Behavioral Tests and Event-Related Potentials in Cochlear Implant Recipients

2005 ◽  
Vol 16 (01) ◽  
pp. 042-053 ◽  
Author(s):  
A.J. Beynon ◽  
A.F.M. Snik ◽  
D.F. Stegeman ◽  
P. van den Broek
Keyword(s):  
Cochlear Implant ◽  
Speech Coding ◽  
Speech Sound ◽  
Event Related Potentials ◽  
Behavioral Strategy ◽  
Normal Range ◽  
Speech Stimuli ◽  
Coding Strategies ◽  
Related Potentials ◽  
Subject Differences

Cortical potentials evoked with speech stimuli were investigated in ten experienced cochlear implant (CI, type Nucleus 24M) users using three different speech-coding strategies and two different speech contrasts, one vowel (/i/-/a/) and one consonant (/ba/-/da/) contrast. On average, results showed that, compared to subjects with normal hearing, P300 amplitudes were smaller; however, most latencies were within the normal range. Next, individual P300 measures in response to the two speech contrasts were compared to behavioral discrimination scores. Significant within-subject differences in P300 amplitudes and latencies were found for the three speech coding strategies. These differences were in agreement with the behavioral, strategy-dependent discrimination of the speech contrasts.

scholarly journals Neural Processing of Spectral and Durational Changes in Speech and Non-speech Stimuli: An MMN Study With Czech Adults

2021 ◽  
Vol 15 ◽  
Author(s):  
Natalia Nudga ◽  
Josef Urbanec ◽  
Zuzana Oceláková ◽  
Jan Kremláček ◽  
Kateřina Chládková
Keyword(s):  
Mismatch Negativity ◽  
Speech Sound ◽  
Event Related Potentials ◽  
Spectral Change ◽  
Sound Processing ◽  
Speech Stimuli ◽  
Asymmetrical Pattern ◽  
Related Potentials ◽  
The Asymmetry ◽  
Phonological Contrasts

Neural discrimination of auditory contrasts is usually studied via the mismatch negativity (MMN) component of the event-related potentials (ERPs). In the processing of speech contrasts, the magnitude of MMN is determined by both the acoustic as well as the phonological distance between stimuli. Also, the MMN can be modulated by the order in which the stimuli are presented, thus indexing perceptual asymmetries in speech sound processing. Here we assessed the MMN elicited by two types of phonological contrasts, namely vowel quality and vowel length, assuming that both will elicit a comparably strong MMN as both are phonemic in the listeners’ native language (Czech) and perceptually salient. Furthermore, we tested whether these phonemic contrasts are processed asymmetrically, and whether the asymmetries are acoustically or linguistically conditioned. The MMN elicited by the spectral change between /a/ and /ε/ was comparable to the MMN elicited by the durational change between /ε/ and /ε:/, suggesting that both types of contrasts are perceptually important for Czech listeners. The spectral change in vowels yielded an asymmetrical pattern manifested by a larger MMN response to the change from /ε/ to /a/ than from /a/ to /ε/. The lack of such an asymmetry in the MMN to the same spectral change in comparable non-speech stimuli spoke against an acoustically-based explanation, indicating that it may instead have been the phonological properties of the vowels that triggered the asymmetry. The potential phonological origins of the asymmetry are discussed within the featurally underspecified lexicon (FUL) framework, and conclusions are drawn about the perceptual relevance of the place and height features for the Czech /ε/-/a/ contrast.

Speech Processing in Autism Spectrum Disorder: An Integrative Review of Auditory Neurophysiology Findings

2021 ◽  
pp. 1-21
Author(s):  
Alexandra P. Key ◽  
Kathryn D'Ambrose Slaboch
Keyword(s):  
Task Complexity ◽  
Speech Sound ◽  
Event Related Potentials ◽  
Communication Disorders ◽  
Autism Spectrum ◽  
Integrative Review ◽  
Speech Sounds ◽  
Neural Responses ◽  
Speech Stimuli ◽  
Related Potentials

Purpose Investigations into the nature of communication disorders in autistic individuals increasingly evaluate neural responses to speech stimuli. This integrative review aimed to consolidate the available data related to speech and language processing across levels of stimulus complexity (from single speech sounds to sentences) and to relate it to the current theories of autism. Method An electronic database search identified peer-reviewed articles using event-related potentials or magnetoencephalography to investigate auditory processing from single speech sounds to sentences in autistic children and adults varying in language and cognitive abilities. Results Atypical neural responses in autistic persons became more prominent with increasing stimulus and task complexity. Compared with their typically developing peers, autistic individuals demonstrated mostly intact sensory responses to single speech sounds, diminished spontaneous attentional orienting to spoken stimuli, specific difficulties with categorical speech sound discrimination, and reduced processing of semantic content. Atypical neural responses were more often observed in younger autistic participants and in those with concomitant language disorders. Conclusions The observed differences in neural responses to speech stimuli suggest that communication difficulties in autistic individuals are more consistent with the reduced social interest than the auditory dysfunction explanation. Current limitations and future directions for research are also discussed.

scholarly journals Logatome Discrimination in Cochlear Implant Users: Subjective Tests Compared to the Mismatch Negativity

2010 ◽  
Vol 10 ◽  
pp. 329-339 ◽  
Author(s):  
Torsten Rahne ◽  
Michael Ziese ◽  
Dorothea Rostalski ◽  
Roland Mühler
Keyword(s):  
Speech Perception ◽  
Cochlear Implant ◽  
Mismatch Negativity ◽  
Speech Intelligibility ◽  
Event Related Potentials ◽  
Normal Hearing ◽  
Discrimination Test ◽  
Speech Database ◽  
Automated Speech Recognition ◽  
Related Potentials

This paper describes a logatome discrimination test for the assessment of speech perception in cochlear implant users (CI users), based on a multilingual speech database, the Oldenburg Logatome Corpus, which was originally recorded for the comparison of human and automated speech recognition. The logatome discrimination task is based on the presentation of 100 logatome pairs (i.e., nonsense syllables) with balanced representations of alternating “vowel-replacement” and “consonant-replacement” paradigms in order to assess phoneme confusions. Thirteen adult normal hearing listeners and eight adult CI users, including both good and poor performers, were included in the study and completed the test after their speech intelligibility abilities were evaluated with an established sentence test in noise. Furthermore, the discrimination abilities were measured electrophysiologically by recording the mismatch negativity (MMN) as a component of auditory event-related potentials. The results show a clear MMN response only for normal hearing listeners and CI users with good performance, correlating with their logatome discrimination abilities. Higher discrimination scores for vowel-replacement paradigms than for the consonant-replacement paradigms were found. We conclude that the logatome discrimination test is well suited to monitor the speech perception skills of CI users. Due to the large number of available spoken logatome items, the Oldenburg Logatome Corpus appears to provide a useful and powerful basis for further development of speech perception tests for CI users.

Phonetic Encoding Contributes to the Processing of Linguistic Prosody at the Word Level: Cross-Linguistic Evidence From Event-Related Potentials

2021 ◽  
pp. 1-11
Author(s):  
Luodi Yu ◽  
Jiajing Zeng ◽  
Suiping Wang ◽  
Yang Zhang
Keyword(s):  
Auditory Processing ◽  
Event Related Potentials ◽  
Event Related Potential ◽  
Acoustic Cues ◽  
Prosodic Features ◽  
Speech Stimuli ◽  
Word Level ◽  
Acoustic Control ◽  
Related Potentials ◽  
Prosodic Phonology

Purpose This study aimed to examine whether abstract knowledge of word-level linguistic prosody is independent of or integrated with phonetic knowledge. Method Event-related potential (ERP) responses were measured from 18 adult listeners while they listened to native and nonnative word-level prosody in speech and in nonspeech. The prosodic phonology (speech) conditions included disyllabic pseudowords spoken in Chinese and in English matched for syllabic structure, duration, and intensity. The prosodic acoustic (nonspeech) conditions were hummed versions of the speech stimuli, which eliminated the phonetic content while preserving the acoustic prosodic features. Results We observed language-specific effects on the ERP that native stimuli elicited larger late negative response (LNR) amplitude than nonnative stimuli in the prosodic phonology conditions. However, no such effect was observed in the phoneme-free prosodic acoustic control conditions. Conclusions The results support the integration view that word-level linguistic prosody likely relies on the phonetic content where the acoustic cues embedded in. It remains to be examined whether the LNR may serve as a neural signature for language-specific processing of prosodic phonology beyond auditory processing of the critical acoustic cues at the suprasyllabic level.

Speech perception with the ACE and the SPEAK speech coding strategies for children implanted with the Nucleus® cochlear implant

2005 ◽  
Vol 69 (12) ◽  
pp. 1667-1674 ◽  
Author(s):  
Manuel Manrique ◽  
Alicia Huarte ◽  
Constantino Morera ◽  
Laura Caballé ◽  
Angel Ramos ◽  
...  
Keyword(s):  
Speech Perception ◽  
Cochlear Implant ◽  
Speech Coding ◽  
Coding Strategies

Saliency of Vowel Features in Neural Responses of Cochlear Implant Users

2018 ◽  
Vol 49 (6) ◽  
pp. 388-397
Author(s):  
François Prévost ◽  
Alexandre Lehmann
Keyword(s):  
Speech Recognition ◽  
Cochlear Implant ◽  
Fundamental Frequency ◽  
Mismatch Negativity ◽  
Free Field ◽  
Event Related Potentials ◽  
Oddball Paradigm ◽  
Aural Rehabilitation ◽  
Spectral Components ◽  
Related Potentials

Cochlear implants restore hearing in deaf individuals, but speech perception remains challenging. Poor discrimination of spectral components is thought to account for limitations of speech recognition in cochlear implant users. We investigated how combined variations of spectral components along two orthogonal dimensions can maximize neural discrimination between two vowels, as measured by mismatch negativity. Adult cochlear implant users and matched normal-hearing listeners underwent electroencephalographic event-related potentials recordings in an optimum-1 oddball paradigm. A standard /a/ vowel was delivered in an acoustic free field along with stimuli having a deviant fundamental frequency (+3 and +6 semitones), a deviant first formant making it a /i/ vowel or combined deviant fundamental frequency and first formant (+3 and +6 semitones /i/ vowels). Speech recognition was assessed with a word repetition task. An analysis of variance between both amplitude and latency of mismatch negativity elicited by each deviant vowel was performed. The strength of correlations between these parameters of mismatch negativity and speech recognition as well as participants’ age was assessed. Amplitude of mismatch negativity was weaker in cochlear implant users but was maximized by variations of vowels’ first formant. Latency of mismatch negativity was later in cochlear implant users and was particularly extended by variations of the fundamental frequency. Speech recognition correlated with parameters of mismatch negativity elicited by the specific variation of the first formant. This nonlinear effect of acoustic parameters on neural discrimination of vowels has implications for implant processor programming and aural rehabilitation.

Effects of Breast Milk and Milk Formula Diets on Synthesized Speech Sound-Induced Event-Related Potentials in 3- and 6-Month-Old Infants

2007 ◽  
Vol 31 (3) ◽  
pp. 349-362 ◽  
Author(s):  
Hongkui Jing ◽  
R. T. Pivik ◽  
Roscoe A. Dykman ◽  
Janet M. Gilchrist ◽  
Thomas M. Badger
Keyword(s):  
Breast Milk ◽  
Speech Sound ◽  
Event Related Potentials ◽  
Milk Formula ◽  
Synthesized Speech ◽  
Related Potentials ◽  
Formula Diets

scholarly journals Brain event-related potentials to phoneme contrasts and their correlation to reading skills in school-age children

2017 ◽  
Vol 42 (3) ◽  
pp. 357-372 ◽  
Author(s):  
Jarmo Hämäläinen ◽  
Nicole Landi ◽  
Otto Loberg ◽  
Kaisa Lohvansuu ◽  
Kenneth Pugh ◽  
...  
Keyword(s):  
Speech Perception ◽  
Phonological Processing ◽  
Reading Skills ◽  
Speech Sound ◽  
Event Related Potentials ◽  
School Age Children ◽  
School Age ◽  
The Us ◽  
Related Potentials ◽  
Us Children

Development of reading skills has been shown to be tightly linked to phonological processing skills and to some extent to speech perception abilities. Although speech perception is also known to play a role in reading development, it is not clear which processes underlie this connection. Using event-related potentials (ERPs) we investigated the speech processing mechanisms for common and uncommon sound contrasts (/ba/-/da/-/ga/ and /ata/-/at: a/) with respect to the native language of school-age children in Finland and the US. In addition, a comprehensive behavioral test battery of reading and phonological processing was administered. ERPs revealed that the children could discriminate between the speech sound contrasts (place of articulation and phoneme length) regardless of their native language. No differences emerged between the Finnish and US children in their change detection responses. The brain responses to the phoneme length contrast, however, correlated robustly with reading scores in the US children, with larger responses being linked to poorer reading skills. Finnish children also showed correlations between the reading and phonological measures and ERP responses, but the pattern of results was not as clear as for the US children. The results indicate that speech perception is linked to reading skills and this link is more robust for uncommon speech sound contrasts.

Event-related potentials for better speech perception in noise by cochlear implant users

2014 ◽  
Vol 316 ◽  
pp. 110-121 ◽  
Author(s):  
Takahiro Soshi ◽  
Satoko Hisanaga ◽  
Narihiro Kodama ◽  
Yori Kanekama ◽  
Yasuhiro Samejima ◽  
...  
Keyword(s):  
Speech Perception ◽  
Cochlear Implant ◽  
Event Related Potentials ◽  
Speech Perception In Noise ◽  
Related Potentials
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