Short Communication: Stimulus expectancy modulates inferior frontal gyrus and premotor cortex activity in auditory perception  

Oleh:

Osnes, Berge ; Hugdahl, Kenneth ; Hjelmervik, Helene ; Specht, Karsten

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Brain and Language (Full Text) vol. 121 no. 1 (2012), page 65-69.
Topik: Auditory perception; Phonetic; Non-phonetic; Instruction effects; Task confounds; fMRI
Fulltext: 121_01_Osnes.pdf (379.57KB)

Isi artikel

In studies on auditory speech perception, participants are often asked to perform active tasks, e.g. decide whether the perceived sound is a speech sound or not. However, information about the stimulus, inherent in such tasks, may induce expectations that cause altered activations not only in the auditory cortex, but also in frontal areas such as inferior frontal gyrus (IFG) and motor cortices, even in the absence of an explicit task. To investigate this, we applied spectral mixes of a flute sound and either vowels or specific music instrument sounds (e.g. trumpet) in an fMRI study, in combination with three different instructions. The instructions either revealed no information about stimulus features, or explicit information about either the music instrument or the vowel features. The results demonstrated that, besides an involvement of posterior temporal areas, stimulus expectancy modulated in particular a network comprising IFG and premotor cortices during this passive listening task.

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