TY - JOUR
T1 - Adaptive paradigms for mapping phonological regions in individual participants
AU - Yen, Melodie
AU - DeMarco, Andrew T.
AU - Wilson, Stephen M.
N1 - Funding Information:
This research was supported in part by the National Institutes of Health ( National Institute on Deafness and Other Communication Disorders ) under grants R01 DC013270 and R21 DC016080 and the National Science Foundation (GRFP to MY). We thank Sarah Brown-Schmidt, Michael de Riesthal, and Melissa Duff for helpful discussions, Leslie McIntosh, Vicky Morgan, and Allen Newton for technical assistance, three reviewers for their valuable and constructive feedback, and all of the participants who took part in the study.
PY - 2019/4/1
Y1 - 2019/4/1
N2 - Phonological encoding depends on left-lateralized regions in the supramarginal gyrus and the ventral precentral gyrus. Localization of these phonological regions in individual participants—including individuals with language impairments—is important in several research and clinical contexts. To localize these regions, we developed two paradigms that load on phonological encoding: a rhyme judgment task and a syllable counting task. Both paradigms relied on an adaptive staircase design to ensure that each individual performed each task at a similarly challenging level. The goal of this study was to assess the validity and reliability of the two paradigms, in terms of their ability to consistently produce left-lateralized activations of the supramarginal gyrus and ventral precentral gyrus in neurologically normal individuals with presumptively normal language localization. Sixteen participants were scanned with fMRI as they performed the rhyme judgment paradigm, the syllable counting paradigm, and an adaptive semantic paradigm that we have described previously. We found that the rhyme and syllable paradigms both yielded left-lateralized supramarginal and ventral precentral activations in the majority of participants. The rhyme paradigm produced more lateralized and more reliable activations, and so should be favored in future applications. In contrast, the semantic paradigm did not reveal supramarginal or precentral activations in most participants, suggesting that the recruitment of these regions is indeed driven by phonological encoding, not language processing in general. In sum, the adaptive rhyme judgment paradigm was effective in localizing left-lateralized phonological encoding regions in individual participants, and, in conjunction with the adaptive semantic paradigm, can be used to map individual language networks.
AB - Phonological encoding depends on left-lateralized regions in the supramarginal gyrus and the ventral precentral gyrus. Localization of these phonological regions in individual participants—including individuals with language impairments—is important in several research and clinical contexts. To localize these regions, we developed two paradigms that load on phonological encoding: a rhyme judgment task and a syllable counting task. Both paradigms relied on an adaptive staircase design to ensure that each individual performed each task at a similarly challenging level. The goal of this study was to assess the validity and reliability of the two paradigms, in terms of their ability to consistently produce left-lateralized activations of the supramarginal gyrus and ventral precentral gyrus in neurologically normal individuals with presumptively normal language localization. Sixteen participants were scanned with fMRI as they performed the rhyme judgment paradigm, the syllable counting paradigm, and an adaptive semantic paradigm that we have described previously. We found that the rhyme and syllable paradigms both yielded left-lateralized supramarginal and ventral precentral activations in the majority of participants. The rhyme paradigm produced more lateralized and more reliable activations, and so should be favored in future applications. In contrast, the semantic paradigm did not reveal supramarginal or precentral activations in most participants, suggesting that the recruitment of these regions is indeed driven by phonological encoding, not language processing in general. In sum, the adaptive rhyme judgment paradigm was effective in localizing left-lateralized phonological encoding regions in individual participants, and, in conjunction with the adaptive semantic paradigm, can be used to map individual language networks.
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U2 - 10.1016/j.neuroimage.2019.01.040
DO - 10.1016/j.neuroimage.2019.01.040
M3 - Article
C2 - 30665008
AN - SCOPUS:85060431986
VL - 189
SP - 368
EP - 379
JO - NeuroImage
JF - NeuroImage
SN - 1053-8119
ER -