Short Communication: Increased activation in superior temporal gyri as a function of increment in phonetic features  

Oleh:

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

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Brain and Language (Full Text) vol. 116 no. 2 (2011), page 97-101.
Topik: Brain; Auditory perception; Temporal lobe; Speech; Music; Phonetic; Parametric stimulation; fMRI
Fulltext: 116_02_Osnes.pdf (328.5KB)

Isi artikel

A common assumption is that phonetic sounds initiate unique processing in the superior temporal gyri and sulci (STG/STS). The anatomical areas subserving these processes are also implicated in the processing of non-phonetic stimuli such as music instrument sounds. The differential processing of phonetic and non-phonetic sounds was investigated in this study by applying a ‘‘sound-morphing” paradigm, where the presence of phonetic features were parametrically varied, creating a step-wise transition from a non-phonetic sound into a phonetic sound. The stimuli were presented in an event-related fMRI design. The fMRI-BOLD data were analysed using parametric contrasts. The results showed a higher sensitivity for sounds containing phonetic features compared to non-phonetic sounds in the middle part of STG, and in the anterior part of the planum temporale (PT) bilaterally. Although the same areas were involved in the processing of non-phonetic sounds, a difference in activation was evident in the STG, with an increase in activation related to increment of phonetic features in the sounds. The results indicate a stimulus- driven, bottom-up process that utilizes general auditory resources in the secondary auditory cortex, depending on specific phonetic features in the sounds.

Opini Anda

Klik untuk menuliskan opini Anda tentang koleksi ini!

Kembali