کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
930201 1474447 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
EEG-power and -coherence changes in a unimodal and a crossmodal working memory task with visual and kinesthetic stimuli
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب رفتاری
پیش نمایش صفحه اول مقاله
EEG-power and -coherence changes in a unimodal and a crossmodal working memory task with visual and kinesthetic stimuli
چکیده انگلیسی

We investigated EEG-power and EEG-coherence changes in a unimodal and a crossmodal matching-to-sample working memory task with either visual or kinesthetic stimuli. Angle-shaped trajectories were used as stimuli presented either as a moving dot on a screen or as a passive movement of a haptic device. Effects were evaluated during the different phases of encoding, maintenance, and recognition. Alpha power was modulated during encoding by the stimulus modality, and in crossmodal conditions during encoding and maintenance by the expected modality of the upcoming test stimulus. These power modulations were observed over modality-specific cortex regions. Systematic changes of coherence for crossmodal compared to unimodal tasks were not observed during encoding and maintenance but only during recognition. There, coherence in the theta-band increased between electrode sites over left central and occipital cortex areas in the crossmodal compared to the unimodal conditions. The results underline the importance of modality-specific representations and processes in unimodal and crossmodal working memory tasks. Crossmodal recognition of visually and kinesthetically presented object features seems to be related to a direct interaction of somatosensory/motor and visual cortex regions by means of long-range synchronization in the theta-band and such interactions seem to take place at the beginning of the recognition phase, i.e. when crossmodal transfer is actually necessary.


► EEG-power and -coherence were studied for distinct phases of a working memory task.
► EEG theta-coherence differs in unimodal and crossmodal working memory tasks.
► Topography of theta-coherence reveals crossmodal coupling.
► Alpha-power reflects modality differences relevant during WM-encoding and -retrieval.
► EEG-power changes reflect anticipatory processes during WM-maintenance.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Psychophysiology - Volume 83, Issue 1, January 2012, Pages 87–95
نویسندگان
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