Neural correlates of switching from auditory to speech perception. Dehaene-Lambertz, G., Pallier, C., Serniclaes, W., Sprenger-Charolles, L., Jobert, A., & Dehaene, S. Neuroimage, 24(1):21-33, 2005. doi abstract bibtex Many people exposed to sinewave analogues of speech first report hearing them as electronic glissando and, later, when they switch into a 'speech mode', hearing them as syllables. This perceptual switch modifies their discrimination abilities, enhancing perception of differences that cross phonemic boundaries while diminishing perception of differences within phonemic categories. Using high-density evoked potentials and fMRI in a discrimination paradigm, we studied the changes in brain activity that are related to this change in perception. With ERPs, we observed that phonemic coding is faster than acoustic coding: The electrophysiological mismatch response (MMR) occurred earlier for a phonemic change than for an equivalent acoustic change. The MMR topography was also more asymmetric for a phonemic change than for an acoustic change. In fMRI, activations were also significantly asymmetric, favoring the left hemisphere in both perception modes. Furthermore, switching to the speech mode significantly enhanced activation in the posterior parts of the left superior gyrus and sulcus relative to the non-speech mode. When responses to a change of stimulus were studied, a cluster of voxels in the supramarginal gyrus was activated significantly more by a phonemic change than by an acoustic change. These results demonstrate that phoneme perception in adults relies on a specific and highly efficient left-hemispheric network, which can be activated in top-down fashion when processing ambiguous speech/non-speech stimuli.
@Article{Dehaene-Lambertz2005,
author = {Ghislaine Dehaene-Lambertz and Christophe Pallier and Willy Serniclaes and Liliane Sprenger-Charolles and Antoinette Jobert and Stanislas Dehaene},
journal = {Neuroimage},
title = {Neural correlates of switching from auditory to speech perception.},
year = {2005},
number = {1},
pages = {21-33},
volume = {24},
abstract = {Many people exposed to sinewave analogues of speech first report hearing
them as electronic glissando and, later, when they switch into a
'speech mode', hearing them as syllables. This perceptual switch
modifies their discrimination abilities, enhancing perception of
differences that cross phonemic boundaries while diminishing perception
of differences within phonemic categories. Using high-density evoked
potentials and fMRI in a discrimination paradigm, we studied the
changes in brain activity that are related to this change in perception.
With ERPs, we observed that phonemic coding is faster than acoustic
coding: The electrophysiological mismatch response (MMR) occurred
earlier for a phonemic change than for an equivalent acoustic change.
The MMR topography was also more asymmetric for a phonemic change
than for an acoustic change. In fMRI, activations were also significantly
asymmetric, favoring the left hemisphere in both perception modes.
Furthermore, switching to the speech mode significantly enhanced
activation in the posterior parts of the left superior gyrus and
sulcus relative to the non-speech mode. When responses to a change
of stimulus were studied, a cluster of voxels in the supramarginal
gyrus was activated significantly more by a phonemic change than
by an acoustic change. These results demonstrate that phoneme perception
in adults relies on a specific and highly efficient left-hemispheric
network, which can be activated in top-down fashion when processing
ambiguous speech/non-speech stimuli.},
doi = {10.1016/j.neuroimage.2004.09.039},
keywords = {Adult, Attention, Auditory, Auditory Pathways, Auditory Perception, Brain, Brain Mapping, Cerebral, Computer-Assisted, Dominance, Evoked Potentials, Female, Humans, Image Processing, Magnetic Resonance Imaging, Male, Phonetics, Reference Values, Speech Perception, 15588593},
}
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This perceptual switch modifies their discrimination abilities, enhancing perception of differences that cross phonemic boundaries while diminishing perception of differences within phonemic categories. Using high-density evoked potentials and fMRI in a discrimination paradigm, we studied the changes in brain activity that are related to this change in perception. With ERPs, we observed that phonemic coding is faster than acoustic coding: The electrophysiological mismatch response (MMR) occurred earlier for a phonemic change than for an equivalent acoustic change. The MMR topography was also more asymmetric for a phonemic change than for an acoustic change. In fMRI, activations were also significantly asymmetric, favoring the left hemisphere in both perception modes. Furthermore, switching to the speech mode significantly enhanced activation in the posterior parts of the left superior gyrus and sulcus relative to the non-speech mode. When responses to a change of stimulus were studied, a cluster of voxels in the supramarginal gyrus was activated significantly more by a phonemic change than by an acoustic change. These results demonstrate that phoneme perception in adults relies on a specific and highly efficient left-hemispheric network, which can be activated in top-down fashion when processing ambiguous speech/non-speech stimuli.","doi":"10.1016/j.neuroimage.2004.09.039","keywords":"Adult, Attention, Auditory, Auditory Pathways, Auditory Perception, Brain, Brain Mapping, Cerebral, Computer-Assisted, Dominance, Evoked Potentials, Female, Humans, Image Processing, Magnetic Resonance Imaging, Male, Phonetics, Reference Values, Speech Perception, 15588593","bibtex":"@Article{Dehaene-Lambertz2005,\n author = {Ghislaine Dehaene-Lambertz and Christophe Pallier and Willy Serniclaes and Liliane Sprenger-Charolles and Antoinette Jobert and Stanislas Dehaene},\n journal = {Neuroimage},\n title = {Neural correlates of switching from auditory to speech perception.},\n year = {2005},\n number = {1},\n pages = {21-33},\n volume = {24},\n abstract = {Many people exposed to sinewave analogues of speech first report hearing\n\tthem as electronic glissando and, later, when they switch into a\n\t'speech mode', hearing them as syllables. This perceptual switch\n\tmodifies their discrimination abilities, enhancing perception of\n\tdifferences that cross phonemic boundaries while diminishing perception\n\tof differences within phonemic categories. Using high-density evoked\n\tpotentials and fMRI in a discrimination paradigm, we studied the\n\tchanges in brain activity that are related to this change in perception.\n\tWith ERPs, we observed that phonemic coding is faster than acoustic\n\tcoding: The electrophysiological mismatch response (MMR) occurred\n\tearlier for a phonemic change than for an equivalent acoustic change.\n\tThe MMR topography was also more asymmetric for a phonemic change\n\tthan for an acoustic change. In fMRI, activations were also significantly\n\tasymmetric, favoring the left hemisphere in both perception modes.\n\tFurthermore, switching to the speech mode significantly enhanced\n\tactivation in the posterior parts of the left superior gyrus and\n\tsulcus relative to the non-speech mode. 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