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The neural correlates of phonological short-term memory: a repetitive transcranial magnetic stimulation study (2006)
| Venue: | J. Cogn. Neurosci |
| Citations: | 11 - 0 self |
BibTeX
@ARTICLE{Romero06theneural,
author = {L. Romero and V. Walsh and C. Papagno},
title = {The neural correlates of phonological short-term memory: a repetitive transcranial magnetic stimulation study},
journal = {J. Cogn. Neurosci},
year = {2006},
pages = {1147--1155}
}
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Abstract
& Neuropsychological reports and activation studies by means of positron emission tomography and functional magnetic res-onance imaging have suggested that the neural correlates of phonological short-term memory are located in the left hemisphere, with Brodmann’s area (BA) 40 being responsi-ble for short-term storage, and BA 44 for articulatory rehearsal. However, a careful review of the literature on the role of left BA 40 shows that the data are equivocal. We tested these hypotheses by means of repetitive transcranial magnetic stim-ulation (rTMS). Participants performed four tasks: two pho-nological judgements, thought to require only articulatory rehearsal without the contribution of short-term storage; a digit span, which involves both, short-term storage and articu-latory rehearsal; and a pattern span, this last being the con-trol task. The sites of stimulation were left BA 40, left BA 44 and the electrode location vtx, plus a baseline without TMS. Reaction times increased and accuracy decreased in the case of the phonological judgements and digit span after stimu-lation of both left sites, suggesting that BA 40, in addition to BA 44, is involved in phonological judgements. Possible ex-planations are discussed, namely, the possibility that (i) the neural correlates of rehearsal are not limited to BA 44 and (ii) phonological judgements involve processes other than rehearsal. We also consider the effects of using different tasks and responses to resolve some of the discrepancies in the literature. &
Keyphrases
neural correlate phonological short-term memory repetitive transcranial magnetic stimulation study phonological judgement short-term storage articulatory rehearsal digit span positron emission tomography reaction time repetitive transcranial magnetic stim-ulation neuropsychological report con-trol task different task careful review pho-nological judgement left hemisphere pattern span articu-latory rehearsal electrode location vtx activation study possible ex-planations functional magnetic res-onance imaging brodmann area left ba
