Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Meta-Analysis
. 2010 Jul;114(1):1-15.
doi: 10.1016/j.bandl.2010.03.008. Epub 2010 Apr 21.

Localization of Sublexical Speech Perception Components

Affiliations
Free PMC article
Meta-Analysis

Localization of Sublexical Speech Perception Components

Peter E Turkeltaub et al. Brain Lang. .
Free PMC article

Abstract

Models of speech perception are in general agreement with respect to the major cortical regions involved, but lack precision with regard to localization and lateralization of processing units. To refine these models we conducted two Activation Likelihood Estimation (ALE) meta-analyses of the neuroimaging literature on sublexical speech perception. Based on foci reported in 23 fMRI experiments, we identified significant activation likelihoods in left and right superior temporal cortex and the left posterior middle frontal gyrus. Sub-analyses examining phonetic and phonological processes revealed only left mid-posterior superior temporal sulcus activation likelihood. A lateralization analysis demonstrated temporal lobe left lateralization in terms of magnitude, extent, and consistency of activity. Experiments requiring explicit attention to phonology drove this lateralization. An ALE analysis of eight fMRI studies on categorical phoneme perception revealed significant activation likelihood in the left supramarginal gyrus and angular gyrus. These results are consistent with a speech processing network in which the bilateral superior temporal cortices perform acoustic analysis of speech and non-speech auditory stimuli, the left mid-posterior superior temporal sulcus performs phonetic and phonological analysis, and the left inferior parietal lobule is involved in detection of differences between phoneme categories. These results modify current speech perception models in three ways: (1) specifying the most likely locations of dorsal stream processing units, (2) clarifying that phonetic and phonological superior temporal sulcus processing is left lateralized and localized to the mid-posterior portion, and (3) suggesting that both the supramarginal gyrus and angular gyrus may be involved in phoneme discrimination.

Figures

Figure 1
Figure 1. Results of the Main Speech versus Nonspeech Analysis (Aim 1)
Significant ALE clusters for the speech versus nonspeech analysis. Top: surface rendering of the left and right hemispheres. Bottom: Coronal slices every 4mm from Talairach Y of 10 to −50. Displayed results are significant at FDR q < .01, 3 or more experiments contributing, cluster size > 100 mm3
Figure 2
Figure 2. Results of Phonetic/Phonological Analysis 1
The significant left STG/STS phonetic processing ALE cluster is shown. Top: surface rendering of the left hemisphere. Bottom: Coronal slices every 4mm from Talairach Y of −12 to −40. Slices are stacked anterior to posterior. Displayed results are significant at FDR q < .01, 3 or more experiments contributing, cluster size > 100 mm3.
Figure 3
Figure 3. Results of Phonetic/Phonological Analysis 2
Areas of greater activation likelihood for experiments using decision tasks than experiments using passive or monitoring tasks are shown in flame scale. Areas of greater activation for passive or monitoring tasks than decision tasks are shown in the blue-green cool scale. Top: Surface renderings of the right and left hemispheres. Bottom: Coronal slices every 4 mm from Talairach Y of −2 to −42. Displayed results are significant at FDR q < .01, 3 or more experiments contributing to the positive side of the subtraction, cluster size > 100 mm3.
Figure 4
Figure 4. Results of Laterality of Sublexical Speech Processing Analysis (Aim 3)
Significant clusters from the subtraction ALE analysis contrasting the left and right temporal lobes in the speech versus nonspeech dataset overlayed on the left hemisphere. Regions in which activation likelihoods were greater in the left hemisphere than right are shown in red-yellow flame scale. Regions in which activation likelihoods were less in the left hemisphere than the right are shown in blue-green cool scale. The right hemisphere is not shown here because it would appear as a perfect mirror image of the left hemisphere. Coronal slices are shown every 4 mm from Talairach Y of 10 to −42. Slices are stacked anterior to posterior. Displayed results are significant at FDR q < .01, cluster size > 100 mm3.
Figure 5
Figure 5. Results of Meta-Analysis 2 (Aim 4)
Significant clusters from the meta-analysis of experiments examining categorical discrimination of phonemes are shown in flame scale. Top: Surface rendering of the left hemisphere. Bottom: Coronal slices are shown every 4 mm from Talairach Y of −30 to −62. Slices are stacked anterior to posterior. Displayed results are significant at FDR q < .01, 3 or more experiments contributing, cluster size > 100 mm3.

Similar articles

See all similar articles

Cited by 68 articles

See all "Cited by" articles

Publication types

Feedback