scholarly journals Functional asymmetry and effective connectivity of the auditory system during speech perception is modulated by the place of articulation of the consonant- A 7T fMRI study

2014 ◽  
Vol 5 ◽  
Author(s):  
Karsten Specht ◽  
Florian Baumgartner ◽  
Jörg Stadler ◽  
Kenneth Hugdahl ◽  
Stefan Pollmann
Keyword(s):  
Speech Perception ◽  
Auditory System ◽  
Effective Connectivity ◽  
Functional Asymmetry ◽  
Place Of Articulation ◽  
Fmri Study ◽  
7T Fmri

scholarly journals Sensorimotor Representation of Speech Perception. Cross-Decoding of Place of Articulation Features during Selective Attention to Syllables in 7T fMRI

eNeuro ◽  
2018 ◽  
Vol 5 (2) ◽  
pp. ENEURO.0252-17.2018 ◽  
Author(s):  
Mario E. Archila-Meléndez ◽  
Giancarlo Valente ◽  
Joao M. Correia ◽  
Rob P. W. Rouhl ◽  
Vivianne H. van Kranen-Mastenbroek ◽  
...  
Keyword(s):  
Speech Perception ◽  
Selective Attention ◽  
Place Of Articulation ◽  
7T Fmri

scholarly journals Lip movements enhance speech representations and effective connectivity in speech dorsal stream and its relationship with neurite architecture

2021 ◽  
Author(s):  
Lei Zhang ◽  
Yi Du
Keyword(s):  
Effective Connectivity ◽  
Dorsal Stream ◽  
Network Connectivity ◽  
Structural Basis ◽  
Speech Comprehension ◽  
Place Of Articulation ◽  
Dorsal Pathway ◽  
Neural Representations ◽  
Fmri Study ◽  
Speech Science

AbstractLip movements facilitate speech comprehension, especially under adverse listening conditions, but the neural mechanisms of this perceptual benefit at the phonemic and feature levels remain unclear. This fMRI study addresses this question by quantifying regional multivariate representation and network organization underlying audiovisual speech-in-noise perception. We found that valid lip movements enhanced neural representations of phoneme, place of articulation, or voicing feature of speech differentially in dorsal stream regions, including frontal speech motor areas and supramarginal gyrus. Such local changes were accompanied by strengthened dorsal stream effective connectivity. Moreover, the neurite orientation dispersion of left arcuate fasciculus, a structural basis of speech dorsal stream, predicted the visual enhancements of neural representations and effective connectivity. Our findings provide novel insight to speech science that lip movements promote both local phonemic and feature encoding and network connectivity in speech dorsal pathway and the functional enhancement is mediated by the microstructural architecture of the circuit.

scholarly journals Evaluation of working memory in relation to cochlear implant consonant speech discrimination

2021 ◽  
Vol 37 (1) ◽  
Author(s):  
Mai M. El Ghazaly ◽  
Mona I. Mourad ◽  
Nesrine H. Hamouda ◽  
Mohamed A. Talaat
Keyword(s):  
Working Memory ◽  
Speech Perception ◽  
High Frequency ◽  
Word List ◽  
Frequency Discrimination ◽  
Frequency Resolution ◽  
Speech Discrimination ◽  
Place Of Articulation ◽  
Strong Positive Relationship ◽  
Speech And Language Development

Abstract Background Speech perception in cochlear implants (CI) is affected by frequency resolution, exposure time, and working memory. Frequency discrimination is especially difficult in CI. Working memory is important for speech and language development and is expected to contribute to the vast variability in CI speech reception and expression outcome. The aim of this study is to evaluate CI patients’ consonants discrimination that varies in voicing, manner, and place of articulation imparting differences in pitch, time, and intensity, and also to evaluate working memory status and its possible effect on consonant discrimination. Results Fifty-five CI patients were included in this study. Their aided thresholds were less than 40 dBHL. Consonant speech discrimination was assessed using Arabic consonant discrimination words. Working memory was assessed using Test of Memory and Learning-2 (TOMAL-2). Subjects were divided according to the onset of hearing loss into prelingual children and postlingual adults and teenagers. Consonant classes studied were fricatives, stops, nasals, and laterals. Performance on the high frequency CVC words was 64.23% ± 17.41 for prelinguals and 61.70% ± 14.47 for postlinguals. These scores were significantly lower than scores on phonetically balanced word list (PBWL) of 79.94% ± 12.69 for prelinguals and 80.80% ± 11.36 for postlinguals. The lowest scores were for the fricatives. Working memory scores were strongly and positively correlated with speech discrimination scores. Conclusions Consonant discrimination using high frequency weighted words can provide a realistic tool for assessment of CI speech perception. Working memory skills showed a strong positive relationship with speech discrimination abilities in CI.

Different Neural Networks Are Involved in Audiovisual Speech Perception Depending on the Context

2014 ◽  
Vol 26 (7) ◽  
pp. 1572-1586 ◽  
Author(s):  
Nicole Malfait ◽  
Pierre Fonlupt ◽  
Laurie Centelles ◽  
Bruno Nazarian ◽  
Liana E. Brown ◽  
...  
Keyword(s):  
Speech Perception ◽  
Neural Representation ◽  
Audiovisual Speech ◽  
Source Information ◽  
Subcortical Structures ◽  
Brain Areas ◽  
Audiovisual Speech Perception ◽  
The Neural Network ◽  
Fmri Study ◽  
Production Areas

How are we able to easily and accurately recognize speech sounds despite the lack of acoustic invariance? One proposed solution is the existence of a neural representation of speech syllable perception that transcends its sensory properties. In the present fMRI study, we used two different audiovisual speech contexts both intended to identify brain areas whose levels of activation would be conditioned by the speech percept independent from its sensory source information. We exploited McGurk audiovisual fusion to obtain short oddball sequences of syllables that were either (a) acoustically different but perceived as similar or (b) acoustically identical but perceived as different. We reasoned that, if there is a single network of brain areas representing abstract speech perception, this network would show a reduction of activity when presented with syllables that are acoustically different but perceived as similar and an increase in activity when presented with syllables that are acoustically similar but perceived as distinct. Consistent with the long-standing idea that speech production areas may be involved in speech perception, we found that frontal areas were part of the neural network that showed reduced activity for sequences of perceptually similar syllables. Another network was revealed, however, when focusing on areas that exhibited increased activity for perceptually different but acoustically identical syllables. This alternative network included auditory areas but no left frontal activations. In addition, our findings point to the importance of subcortical structures much less often considered when addressing issues pertaining to perceptual representations.

Audio-visual speech perception in adult readers with dyslexia: an fMRI study

2017 ◽  
Vol 12 (2) ◽  
pp. 357-368 ◽  
Author(s):  
Jascha Rüsseler ◽  
Zheng Ye ◽  
Ivonne Gerth ◽  
Gregor R. Szycik ◽  
Thomas F. Münte
Keyword(s):  
Speech Perception ◽  
Visual Speech ◽  
Adult Readers ◽  
Fmri Study ◽  
Visual Speech Perception

scholarly journals Hippocampal functional connectivity in Alzheimer’s disease: a resting state 7T fMRI study

2020 ◽  
pp. 1-2 ◽  
Author(s):  
Latha Velayudhan ◽  
Susan Francis ◽  
Richard Dury ◽  
Subhadip Paul ◽  
Sana Bestwn ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Functional Connectivity ◽  
Resting State ◽  
Fmri Study ◽  
7T Fmri
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