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Examining the contribution of motor movement and language dominance to increased left lateralization during sign generation in native signers

Gutierrez-Sigut, Eva and Payne, Heather and MacSweeney, Mairéad (2016) 'Examining the contribution of motor movement and language dominance to increased left lateralization during sign generation in native signers.' Brain and Language, 159. 109 - 117. ISSN 0093-934X

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Abstract

The neural systems supporting speech and sign processing are very similar, although not identical. In a previous fTCD study of hearing native signers (Gutierrez-Sigut, Daws, et al., 2015) we found stronger left lateralization for sign than speech. Given that this increased lateralization could not be explained by hand movement alone, the contribution of motor movement versus ‘linguistic’ processes to the strength of hemispheric lateralization during sign production remains unclear. Here we directly contrast lateralization strength of covert versus overt signing during phonological and semantic fluency tasks. To address the possibility that hearing native signers’ elevated lateralization indices (LIs) were due to performing a task in their less dominant language, here we test deaf native signers, whose dominant language is British Sign Language (BSL). Signers were more strongly left lateralized for overt than covert sign generation. However, the strength of lateralization was not correlated with the amount of time producing movements of the right hand. Comparisons with previous data from hearing native English speakers suggest stronger laterality indices for sign than speech in both covert and overt tasks. This increased left lateralization may be driven by specific properties of sign production such as the increased use of self-monitoring mechanisms or the nature of phonological encoding of signs.

Item Type: Article
Uncontrolled Keywords: fTCD, Language lateralization, Overt language production, Sign language, Phonological fluency, Semantic fluency
Divisions: Faculty of Science and Health > Psychology, Department of
Depositing User: Elements
Date Deposited: 28 Aug 2019 12:25
Last Modified: 28 Aug 2019 13:15
URI: http://repository.essex.ac.uk/id/eprint/25217

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