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Beyond aphasia : altered EEG connectivity in Brocaʼs patients during working memory task
Rutar, Veronika ...
Brocaʼs region and adjacent cortex presumably take part in working memory (WM) processes. Electrophysiologically, these processes are reflected in synchronized oscillations. We present the first ...study exploring the effects of a stroke causing Brocaʼs aphasia on these processes and specifically on syn- chronized functional WM networks. We used high-density EEG and coherence analysis to map WM net- works in ten Brocaʼs patients and ten healthy controls during verbal WM task. Our results demonstrate that a stroke resulting in Brocaʼs aphasia also alters two distinct WM networks. These theta and gamma functional networks likely reflect the executive and the phonological processes, respectively. The striking imbalance between task-related theta synchronization and desynchronization in Broca%s patients might represent a disrupted balance between task-positive and WM-irrelevant functional networks. There is complete disintegration of left fronto-centroparietal gamma network in Brocaʼs patients, which could reflect the damaged phonological loop.
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