Exploring the Processing Continuum of Single-Word Comprehension in Aphasia

Moineau, Suzanne; Dronkers, Nina F.; Bates, Elizabeth

doi:10.1044/1092-4388(2005/061)

Cited by 60 publications

(46 citation statements)

References 30 publications

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“…However, although our work demonstrates the tight coupling between auditory and articulatory information, it does not allow us to conclude that motor processes are required in speech perception [as in single-pathway architectures in which motor representations mediate the acoustic and linguistic processing of speech (17,18)]. Such inferences about causality can be drawn conclusively only by studying speech perception in situations in which motor processes are impaired through temporary lesions [as in TMS (5, 6)] or as a result of brain injury (19,20). However, further work establishing the temporal character of motor activation in speech perception could also be important in this respect.…”

Section: Discussionmentioning

confidence: 99%

Activation of articulatory information in speech perception

Yuen

Davis

Brysbaert

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

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Emerging neurophysiologic evidence indicates that motor systems are activated during the perception of speech, but whether this activity reflects basic processes underlying speech perception remains a matter of considerable debate. Our contribution to this debate is to report direct behavioral evidence that specific articulatory commands are activated automatically and involuntarily during speech perception. We used electropalatography to measure whether motor information activated from spoken distractors would yield specific distortions on the articulation of printed target syllables. Participants produced target syllables beginning with /k/ or /s/ while listening to the same syllables or to incongruent rhyming syllables beginning with /t/. Tongue-palate contact for target productions was measured during the articulatory closure of /k/ and during the frication of /s/. Results revealed "traces" of the incongruent distractors on target productions, with the incongruent /t/-initial distractors inducing greater alveolar contact in the articulation of /k/ and /s/ than the congruent distractors. Two further experiments established that (i) the nature of this interference effect is dependent specifically on the articulatory properties of the spoken distractors; and (ii) this interference effect is unique to spoken distractors and does not arise when distractors are presented in printed form. Results are discussed in terms of a broader emerging framework concerning the relationship between perception and action, whereby the perception of action entails activation of the motor system. motor theory | perception-action relationship | speech production | interference | electropalatography O ne of the most exciting questions in the neuroscience of language concerns the involvement of the motor system in the perception of speech: is the motor system activated during speech perception, and does it play a causal role? Key studies using functional MRI have demonstrated that the brain regions involved in the perception of speech overlap with those involved in the production of speech (1) in a manner that seems to be articulator specific (2). Similarly, studies using transcranial magnetic stimulation (TMS) have shown potentiation of motor cortex representations of the lip (3) and tongue (4) muscles when participants listen to speech. Finally, recent work using repetitive TMS has revealed that disruption to regions of the premotor cortex impacts on perceptual discrimination of speech sounds (5) in a somatotopic manner (6). These studies are all consistent with the proposal that the motor system is activated (and perhaps even essential) in the perception of speech.However, although there is agreement that motor regions can be activated in speech perception studies, recent reviews of the literature have raised two important challenges over precisely what drives this activation (7,8). The first challenge stems from the fact that neuroimaging data have been inconsistent, with relatively few studies showing motor activity at a whole-br...

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Section: Discussionmentioning

confidence: 99%

Activation of articulatory information in speech perception

Yuen

Davis

Brysbaert

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

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“…For example, a neuroimaging study revealed that, during an /r/ versus /l/ consonant identification task, Broca's area was more activated in Japanese speakers whose mother tongue did not differentiate the two consonant sounds than in native English speakers (Callan et al, 2004). Motor systems may also contribute to perception in adverse listening circumstances, as evidenced by the specific perceptual difficulty patients with Broca's aphasia experience when speech signals are degraded (Utman et al, 2001;Moineau et al, 2005). The current findings lend further support to the theory that auditory and motor systems interact during speech perception.…”

Section: Possible Roles Of Broca's Area In Speech Perceptionmentioning

confidence: 99%

Categorical Speech Processing in Broca's Area: An fMRI Study Using Multivariate Pattern-Based Analysis

Lee¹,

Turkeltaub²,

Granger³

et al. 2012

J. Neurosci.

119

121

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Although much effort has been directed toward understanding the neural basis of speech processing, the neural processes involved in the categorical perception of speech have been relatively less studied, and many questions remain open. In this functional magnetic resonance imaging (fMRI) study, we probed the cortical regions mediating categorical speech perception using an advanced brain-mapping technique, whole-brain multivariate pattern-based analysis (MVPA). Normal healthy human subjects (native English speakers) were scanned while they listened to 10 consonant-vowel syllables along the /ba/-/da/ continuum. Outside of the scanner, individuals' own category boundaries were measured to divide the fMRI data into /ba/ and /da/ conditions per subject. The whole-brain MVPA revealed that Broca's area and the left pre-supplementary motor area evoked distinct neural activity patterns between the two perceptual categories (/ba/ vs /da/). Broca's area was also found when the same analysis was applied to another dataset (Raizada and Poldrack, 2007), which previously yielded the supramarginal gyrus using a univariate adaptation-fMRI paradigm. The consistent MVPA findings from two independent datasets strongly indicate that Broca's area participates in categorical speech perception, with a possible role of translating speech signals into articulatory codes. The difference in results between univariate and multivariate pattern-based analyses of the same data suggest that processes in different cortical areas along the dorsal speech perception stream are distributed on different spatial scales.

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“…Moineau, Dronkers, & Bates, 2005;Utman, Blumstein, & Sullivan, 2001), or from studies in which TMS is used to transiently interfere with neural processes in motor regions (D'Ausilio, 2007;Meister, Wilson, Deblieck, Wu, & Iacoboni, 2007;Mottonen & Watkins, 2009). We note with interest, however, that all these studies show modulation of perception of speech that has been degraded*either by artificial speech manipulations (D'Ausilio, 2007;Meister et al, 2007;Moineau et al, 2005) or by the use of phonemically ambiguous materials (Mottonen & Watkins, 2009;Utman et al, 2001). These studies, therefore, converge with our fMRI work in suggesting that motor responses to speech are more likely of functional significance in listening situations in which the perception of speech is challenged by noise or phonetic ambiguity.…”

Section: Motor-cortical Responses To Degraded Speechmentioning

confidence: 99%