Neural substrates for verbal working memory in deaf signers: fMRI study and lesion case report  

Oleh:

Buchsbaum, Bradley ; Pickell, Bert ; Love, Tracy ; Hatrak, Marla ; Bellugi, Ursula ; Hickok, Gregory

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Brain and Language (Full Text) vol. 95 no. 2 (2005), page 265-272.
Topik: Sign language; ASL; Working memory; fMRI
Fulltext: 95_02_Buchsbaum.pdf (361.97KB)

Isi artikel

The nature of the representations maintained in verbal working memory is a topic of debate. Some authors argue for a modality dependent code, tied to particular sensory or motor systems. Others argue for a modality–neutral code. Sign language afords a unique perspective because it factors out the effects of modality. In an fMRI experiment, deaf participants viewed and covertly rehearsed strings of non-sense signs; analyses focused on regions responsive in both sensory and rehearsal phases. Compared with previous findings in hearing subjects, deaf subjects showed a significantly increased involvement of parietal regions. A lesion case study indicates that this network is left-dominant. The findings support the hypothesis that linguistic working memory is supported by modality–specific neural systems, but some modality–neutral systems may also be involved.

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