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- W2091800221 abstract "Perceptual grouping of successive frequency components, namely, auditory streaming, is essential for auditory scene analysis. Prolonged listening to an unchanging triplet-tone sequence produces a series of illusory switches between a single coherent stream (S1) and two distinct streams (S2). The predominant percept depends on the frequency difference (Δ f ) between high and low tones. Here, we combined the use of different Δ f s with an event-related fMRI design to identify whether the temporal dynamics of brain activity differs depending on the direction of perceptual switches. The results demonstrated that the activity of the medial geniculate body (MGB) in the thalamus occurred earlier during switching from nonpredominant to predominant percepts, whereas that of the auditory cortex (AC) occurred earlier during switching from predominant to nonpredominant percepts, regardless of Δ f . The asymmetry of temporal precedence indicates that the MGB and AC activations play different roles in perceptual switching and depend on perceptual predominance rather than on S1 and S2 percepts per se. Our results suggest that feedforward and feedback processes in the thalamocortical loop are involved in the formation of percepts in auditory streaming." @default.
- W2091800221 created "2016-06-24" @default.
- W2091800221 creator A5057245021 @default.
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- W2091800221 date "2009-10-07" @default.
- W2091800221 modified "2023-10-12" @default.
- W2091800221 title "Involvement of the Thalamocortical Loop in the Spontaneous Switching of Percepts in Auditory Streaming" @default.
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- W2091800221 doi "https://doi.org/10.1523/jneurosci.1549-09.2009" @default.
- W2091800221 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6665088" @default.
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