Selective attention to phonology dynamically modulates initial encoding of auditory words within the left hemisphere.
Bottom Line: Data-driven source localization analyses revealed that selective attention to phonology led to significantly greater recruitment of left-lateralized posterior and extensive temporal regions, which was notably concurrent with the rhyme-relevant information within the word.Furthermore, selective attention effects were specific to auditory stimulus encoding and not observed in response to cues, arguing against the notion that they reflect sustained task setting.Collectively, these results demonstrate that selective attention to phonology dynamically engages a left-lateralized network during the critical time-period of perception for achieving phonological analysis goals.
Affiliation: Department of Child and Adolescent Psychiatry, Child Study Center, New York University, USA.Show MeSH
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Mentions: In light of our a priori interest in isolating specifically the effect of selective attention to phonology, and in line with our previous fMRI findings (Yoncheva et al., 2010), we analyzed the sources in which activity significantly differs within subjects based on selective attention. Robust task differences in the source space (local fdrp < 0.05) with rhyme judgment activations greater than tone judgment activations emerged only in one segment: 496–542 ms. This contrast revealed significant source nodes, comprising a network in the left hemisphere, which spanned fusiform and lingual gyri and extensive inferior, middle, and superior temporal regions as illustrated in Fig. 3. In contrast, in the segment closely before the onset of stimulus two (804–836 ms) nodes emerged as significant only from the tone > rhyme judgment contrast (Fig. 4). These consisted of bilateral frontal regions: middle frontal gyrus extending to more medial regions, as well as inferior and superior frontal gyri, pre-motor areas, and the anterior cingulate gyrus. Additionally, a right-hemispheric modulation of temporal regions (superior and mid-temporal gyrus) was observed (Fig. 3).
Affiliation: Department of Child and Adolescent Psychiatry, Child Study Center, New York University, USA.