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

Vihla, Minna; Lounasmaa, O. V.; Salmelin, Riitta

doi:10.1073/pnas.180317297

Cited by 30 publications

(20 citation statements)

References 21 publications

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“…This finding agrees with previous studies that have shown that, for speech sounds, the amplitude of the mismatch response depends on both native phoneme category membership and absolute acoustic difference from the standard (21). In common with Vihla et al (22), we found no significant difference in the mismatch response amplitude associated with the phoneme category deviants, D2 and D3, despite these being further away from each other in terms of acoustic difference than D2 is from the standard. Therefore, the main perceptual driver for mismatch response to D2 and D3 appears to be phoneme change rather than acoustic difference.…”

Section: Discussionsupporting

confidence: 90%

Changing meaning causes coupling changes within higher levels of the cortical hierarchy

Schofield

Iverson

Kiebel

et al. 2009

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

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Processing of speech and nonspeech sounds occurs bilaterally within primary auditory cortex and surrounding regions of the superior temporal gyrus; however, the manner in which these regions interact during speech and nonspeech processing is not well understood. Here, we investigate the underlying neuronal architecture of the auditory system with magnetoencephalography and a mismatch paradigm. We used a spoken word as a repeating ''standard'' and periodically introduced 3 ''oddball'' stimuli that differed in the frequency spectrum of the word's vowel. The closest deviant was perceived as the same vowel as the standard, whereas the other 2 deviants were perceived as belonging to different vowel categories. The neuronal responses to these vowel stimuli were compared with responses elicited by perceptually matched tone stimuli under the same paradigm. For both speech and tones, deviant stimuli induced coupling changes within the same bilateral temporal lobe system. However, vowel oddball effects increased coupling within the left posterior superior temporal gyrus, whereas perceptually equivalent nonspeech oddball effects increased coupling within the right primary auditory cortex. Thus, we show a dissociation in neuronal interactions, occurring at both different hierarchal levels of the auditory system (superior temporal versus primary auditory cortex) and in different hemispheres (left versus right). This hierarchical specificity depends on whether auditory stimuli are embedded in a perceptual context (i.e., a word). Furthermore, our lateralization results suggest left hemisphere specificity for the processing of phonological stimuli, regardless of their elemental (i.e., spectrotemporal) characteristics. dynamic causal modeling ͉ language ͉ magnetoencephalography ͉ mismatch negativity ͉ predictive coding

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Section: Discussionsupporting

confidence: 90%

Changing meaning causes coupling changes within higher levels of the cortical hierarchy

Schofield

Iverson

Kiebel

et al. 2009

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

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“…An interesting twist to the way MMN parameters reflect differences between vowels and differences between complex tones consisting of the two lowest formant frequencies of those vowels was presented by Vihla et al [2000]. They found, as expected, that the complex tones produced larger MMN amplitude when the spectral differences were larger.…”

Section: Human Datamentioning

confidence: 67%

The Neurophysiology of Auditory Perception: From Single Units to Evoked Potentials

Eggermont

Ponton²

2002

Audiol Neurotol

174

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Evoked electric potential and magnetic field studies have the immense benefit that they can be conducted in awake, behaving humans and can be directly correlated with aspects of perception. As such, they are powerful objective indicators of perceptual properties. However, given a set of evoked potential and/or evoked field waveforms and their source locations, obtained for an exhaustive set of stimuli and stimulus contrasts, is it possible to determine blindly, i.e. predict, what the stimuli or stimulus contrasts were? If this can be done with some success, then a useful amount of information resides in scalp-recorded activity for, e.g., the study of auditory speech processing. In this review, we compare neural representations based on single-unit and evoked response activity for vowels and consonant-vowel phonemes with distinctions in formant glides and voice onset time. We conclude that temporal aspects of evoked responses can track some of the dominant response features present in single-unit activity. However, N₁ morphology does not reliably predict phonetic identification of stimuli varying in voice onset time, and the reported appearance of a double-peak onset response in aggregate recordings from the auditory cortex does not indicate a cortical correlate of the perception of voicelessness. This suggests that temporal aspects of single-unit population activity are likely not inclusive enough for representation of categorical perception boundaries. In contrast to population activity based on single-unit recording, the ability to accurately localize the sources of scalp-evoked activity is one of the bottlenecks in obtaining an accessible neurophysiological substrate of perception. Attaining this is one of the requisites to arrive at the prospect of blind determination of stimuli on the basis of evoked responses. At the current sophistication level of recording and analysis, evoked responses remain in the realm of extremely sensitive objective indicators of stimulus change or stimulus differences. As such, they are signs of perceptual activity, but not comprehensive representations thereof.

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“…The special acoustic nature of speech is reflected in activation within the posterior superior temporal cortex [Benson et al, 2006;Vouloumanos et al, 2001] at around 100 ms [Eulitz et al, 1995;Tiitinen et al, 1999], especially in the left hemisphere [Parviainen et al, 2005]. Phonological categories seem to be available by 150-200 ms [Phillips et al, 2000;Vihla et al, 2000], after which the activation reflects higher-level linguistic processing [Connolly and Phillips, 1994;Helenius et al, 2002].…”

Section: Introductionmentioning

confidence: 99%

Speech perception in the child brain: Cortical timing and its relevance to literacy acquisition

Parviainen

Helenius

Poskiparta

et al. 2011

Human Brain Mapping

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Speech processing skills go through intensive development during mid-childhood, providing basis also for literacy acquisition. The sequence of auditory cortical processing of speech has been characterized in adults, but very little is known about the neural representation of speech sound perception in the developing brain. We used whole-head magnetoencephalography (MEG) to record neural responses to speech and nonspeech sounds in first-graders (7-8-year-old) and compared the activation sequence to that in adults. In children, the general location of neural activity in the superior temporal cortex was similar to that in adults, but in the time domain the sequence of activation was strikingly different. Cortical differentiation between sound types emerged in a prolonged response pattern at about 250 ms after sound onset, in both hemispheres, clearly later than the corresponding effect at about 100 ms in adults that was detected specifically in the left hemisphere. Better reading skills were linked with shorter-lasting neural activation, speaking for interdependence of the maturing neural processes of auditory perception and developing linguistic skills. This study uniquely utilized the potential of MEG in comparing both spatial and temporal characteristics of neural activation between adults and children. Besides depicting the group-typical features in cortical auditory processing, the results revealed marked interindividual variability in children.

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

Cited by 30 publications

References 21 publications

Changing meaning causes coupling changes within higher levels of the cortical hierarchy

Changing meaning causes coupling changes within higher levels of the cortical hierarchy

The Neurophysiology of Auditory Perception: From Single Units to Evoked Potentials

Speech perception in the child brain: Cortical timing and its relevance to literacy acquisition

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