Activations of human auditory cortex to phonemic and nonphonemic vowels during discrimination and memory tasks

Kirsi Harinen, Teemu Rinne*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)

Abstract

We used fMRI to investigate activations within human auditory cortex (AC) to vowels during vowel discrimination, vowel (categorical n-back) memory, and visual tasks. Based on our previous studies, we hypothesized that the vowel discrimination task would be associated with increased activations in the anterior superior temporal gyrus (STG), while the vowel memory task would enhance activations in the posterior STG and inferior parietal lobule (IPL). In particular, we tested the hypothesis that activations in the IPL during vowel memory tasks are associated with categorical processing. Namely, activations due to categorical processing should be higher during tasks performed on nonphonemic (hard to categorize) than on phonemic (easy to categorize) vowels.As expected, we found distinct activation patterns during vowel discrimination and vowel memory tasks. Further, these task-dependent activations were different during tasks performed on phonemic or nonphonemic vowels. However, activations in the IPL associated with the vowel memory task were not stronger during nonphonemic than phonemic vowel blocks. Together these results demonstrate that activations in human AC to vowels depend on both the requirements of the behavioral task and the phonemic status of the vowels.

Original languageEnglish
Pages (from-to)279-287
Number of pages9
JournalNeuroImage
Volume77
DOIs
Publication statusPublished - 5 Aug 2013
MoE publication typeA1 Journal article-refereed

Keywords

  • Auditory cortex
  • Categorical processing
  • FMRI
  • Inferior parietal lobule
  • Speech

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