Magnetic mismatch fields elicited by vowels and consonants

Diesch, Eugen; Luce, Thomas

doi:10.1007/pl00005734

Cited by 35 publications

(22 citation statements)

References 77 publications

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“…On the other hand, no differences in location or magnitude could be demonstrated between the various deviants. This is somewhat inconsistent with reports that the location of the MMF source depends on the dimension of change (Giard et al, 1995;Alho et al, 1996;FrodlBauch et al, 1997;Diesch and Luce, 1997;Takegata et al, 2001). However, most of these studies used nonspeech sounds, which were varied in pitch/ frequency, duration, intensity, or sound location.…”

Section: Hemispherical Specializationmentioning

confidence: 85%

“…However, most of these studies used nonspeech sounds, which were varied in pitch/ frequency, duration, intensity, or sound location. With respect to higher level parameters, Diesch and Luce (1997) presented evidence for the existence of different neuronal populations underlying the MMN elicited by different phonetic contrasts in consonant-vowel syllables. The dipole positions differed at most about 10 mm in the horizontal plane.…”

Section: Hemispherical Specializationmentioning

confidence: 99%

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Early Parallel Processing of Auditory Word and Voice Information

et al. 2002

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The present study investigates the relationship of linguistic (phonetic) and extralinguistic (voice) information in preattentive auditory processing. We provide neurophysiological data, which show for the first time that both kinds of information are processed in parallel at an early preattentive stage. In order to establish the temporal and spatial organization of the underlying neuronal processes, we studied the conjunction of voice and word deviations in a mismatch negativity experiment, whereby the listener's brain responses were collected using magnetoencephalography. The stimuli consisted of single spoken words, whereby the deviants manifested a change of the word, of the voice, or both word and voice simultaneously (combined). First, we identified the N100m (overlain by mismatch field, MMF) and localized its generators, analyzing N100m/MMF latency, dipole localization, and dipole strength. While the responses evoked by deviant stimuli were more anterior than the standard, localization differences between the deviants could not be shown. The dipole strength was larger for deviants than the standard stimulus, but again, no differences between the deviants could be established. There was no difference in the hemispheric lateralization of the responses. However, a difference between the deviants was observed in the latencies. The N100m/MMF revealed a significantly shorter and less variant latency for the combined stimulus compared to all other experimental conditions. The data suggest an integral parallel processing model, which describes the early extraction of phonetic and voice information from the speech signal as parallel and contingent processes. © 2002 Elsevier Science (USA)

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Section: Hemispherical Specializationmentioning

confidence: 85%

Section: Hemispherical Specializationmentioning

confidence: 99%

Early Parallel Processing of Auditory Word and Voice Information

et al. 2002

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“…This may contribute to the defective language development in individuals with CPO. The shorter STM in the subgroup with CPO at the age of 7 to 9 years could then be an expression of poorer STM traces, because poorer memory trace definition results faster decay due to the neural and external interference (Diesch 1997).…”

Section: Discussionmentioning

confidence: 99%

Dysfunction of the auditory cortex persists in infants with certain cleft types

Čėponiené

Hukki

Cheour

et al. 2000

Develop Med Child Neuro

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Language and learning disabilities occur in almost half of individuals with oral clefts. The characteristics of these cognitive dysfunctions vary according to the cleft type, and the mechanisms underlying the relation between cleft type, cognitive dysfunction, and cleft-caused middle-ear disease are unknown. This study investigates preattentive auditory discrimination, which plays a significant role in language acquisition and usage, in infants with different cleft types. A mismatch negativity (MMN) component of brain evoked potentials, which indexes preconscious sound discrimination, and brain responses to rare sine-wave tones were recorded in 12 healthy infants and 32 infants with oral clefts at the ages of 0 and 6 months. Infants with clefts were subdivided into two categories: those with cleft lip and palate (CLP) (n=11 at birth, n=6 at the age of 6 months) and those with cleft palate only (CPO) (n=17 at birth, n=8 at the age of 6 months). At both ages, brain responses to rare sounds tended to be smaller in both cleft subgroups than in healthy peers. However, in the latency range of 300 to 500 ms, the MMN was significantly smaller in infants with CPO. In infants with CLP, the MMN was comparable to that of healthy infants. Differences in auditory discrimination between infants with CLP and CPO, as reflected by MMN, were detectable at birth and persisted into later infancy. This pattern parallels known behavioural differences between children with these cleft types. Brain responses to rare sounds, in contrast, had no differentiative power with respect to the cleft type.

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“…Mismatch negativity and its magnetic counterpart MMF are considered to reflect the detection of dissimilarity between the signal and the stimulus represented by previous auditory memory traces (7). Mismatch responses have been observed for rising vs. falling glides (8) and phonetic contrasts (9,10). A phonetically relevant change in the stimuli (a transition of the second formant signaling a consonantal change) has been found to produce an MMF, despite variation of F0 in both standard and deviant stimuli (11).…”

mentioning

confidence: 96%

Cortical processing of change detection: Dissociation between natural vowels and two-frequency complex tones

Vihla¹,

Lounasmaa²,

Salmelin³

2000

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

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We compared magnetoencephalographic responses for natural vowels and for sounds consisting of two pure tones that represent the two lowest formant frequencies of these vowels. Our aim was to determine whether spectral changes in successive stimuli are detected differently for speech and nonspeech sounds. The stimuli were presented in four blocks applying an oddball paradigm (20% deviants, 80% standards): (i) /ɑ/ tokens as deviants vs. /i/ tokens as standards; (ii) /e/ vs. /i/; (iii) complex tones representing /ɑ/ formants vs. /i/ formants; and (iv) complex tones representing /e/ formants vs. /i/ formants. Mismatch fields (MMFs) were calculated by subtracting the source waveform produced by standards from that produced by deviants. As expected, MMF amplitudes for the complex tones reflected acoustic deviation: the amplitudes were stronger for the complex tones representing /ɑ/ than /e/ formants, i.e., when the spectral difference between standards and deviants was larger. In contrast, MMF amplitudes for the vowels were similar despite their different spectral composition, whereas the MMF onset time was longer for /e/ than for /ɑ/. Thus the degree of spectral difference between standards and deviants was reflected by the MMF amplitude for the nonspeech sounds and by the MMF latency for the vowels.

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Magnetic mismatch fields elicited by vowels and consonants

Cited by 35 publications

References 77 publications

Early Parallel Processing of Auditory Word and Voice Information

Early Parallel Processing of Auditory Word and Voice Information

Dysfunction of the auditory cortex persists in infants with certain cleft types

Cortical processing of change detection: Dissociation between natural vowels and two-frequency complex tones

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