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MeSH: motorické korové centrum-anatomie a histologie

6 záznamů v PubMed Filtry

Článek

On the effects of multimodal information integration in multitasking

Stock, Ann-Kathrin
Autor Stock, Ann-Kathrin ORCID Cognitive Neurophysiology, Department of Child and Adolescent Psychiatry, Carl Gustav Carus Faculty of Medicine, TU Dresden, Germany. Ann-Kathrin.Stock@uniklinikum-dresden.de
Gohil, Krutika
Autor Gohil, Krutika Cognitive Neurophysiology, Department of Child and Adolescent Psychiatry, Carl Gustav Carus Faculty of Medicine, TU Dresden, Germany
Huster, René J
Autor Huster, René J Department of Psychology, University of Oslo, Oslo, Norway
Beste, Christian
Autor Beste, Christian Cognitive Neurophysiology, Department of Child and Adolescent Psychiatry, Carl Gustav Carus Faculty of Medicine, TU Dresden, Germany Experimental Neurobiology, National Institute of Mental Health, Klecany, Czech Republic

Scientific reports. 2017 Jul 07 ; 7 (1) : 4927. [epub] 20170707

Sci Rep
ISSN 2045-2322
Zdroj

There have recently been considerable advances in our understanding of the neuronal mechanisms underlying multitasking, but the role of multimodal integration for this faculty has remained rather unclear. We examined this issue by comparing different modality combinations in a multitasking (stop-change) paradigm. In-depth neurophysiological analyses of event-related potentials (ERPs) were conducted to complement the obtained behavioral data. Specifically, we applied signal decomposition using second order blind identification (SOBI) to the multi-subject ERP data and source localization. We found that both general multimodal information integration and modality-specific aspects (potentially related to task difficulty) modulate behavioral performance and associated neurophysiological correlates. Simultaneous multimodal input generally increased early attentional processing of visual stimuli (i.e. P1 and N1 amplitudes) as well as measures of cognitive effort and conflict (i.e. central P3 amplitudes). Yet, tactile-visual input caused larger impairments in multitasking than audio-visual input. General aspects of multimodal information integration modulated the activity in the premotor cortex (BA 6) as well as different visual association areas concerned with the integration of visual information with input from other modalities (BA 19, BA 21, BA 37). On top of this, differences in the specific combination of modalities also affected performance and measures of conflict/effort originating in prefrontal regions (BA 6).

Článek

Source activity in the human secondary somatosensory cortex depends on the size of corpus callosum

Brain research. 2002 May 17 ; 936 (1-2) : 47-57.

Brain Res
ISSN 0006-8993
Zdroj

If corpus callosum (CC) mediates the activation of the secondary somatosensory area (SII) ipsilateral to the side of stimulation, then the peak latencies of the contra- and ipsilateral SII activity as well as the amplitude of the ipsilateral SII activity should correlate with the size of CC. Innocuous electrical stimuli of five different intensities were applied to the ventral surface of the right index finger in 15 right-handed men. EEG was recorded using 82 closely spaced electrodes. The size of CC and of seven callosal regions was measured from the mid-sagittal slice of a high-resolution anatomical MRI. The activation in the contralateral and ipsilateral SII was evaluated using spatio-temporal source analysis. At the strongest stimulus intensity, the size of the intermediate part of the callosal truncus correlated negatively with the interpeak latency of the sources in ipsi- and contralateral SII (r = -0.83, P < 0.01). Stepwise regression analysis showed that the large size of the intermediate truncus of CC was paralleled by a latency reduction of peak activity of the ipsilateral SII, whereas both contra- and ipsilateral peak latencies were positively correlated. The peak amplitude of the ipsilateral SII source correlated positively with the size of the intermediate truncus of CC, and with the peak amplitudes of sources in the primary somatosensory cortex (SI) and in the mesial frontal cortex. The results suggest that in right-handed neurologically normal men, the size of the intermediate callosal truncus contributes to the timing and amplitude of ipsilateral SII source activity.

Článek

The electroencephalographic beta synchronization following extension and flexion finger movements in humans

Stancák, A Jr
Autor Stancák, A Charles University, Third Faculty of Medicine, Department of Normal, Pathological and Clinical Physiology, Ke Karlovu 4, 120 00, Prague, Czech Republic. stancak@physio.1f3.cuni.cz

Neuroscience letters. 2000 Apr 21 ; 284 (1-2) : 41-4.

Neurosci Lett
ISSN 0304-3940
Zdroj

The cortical post-movement beta synchronization (PMBS) following brisk extension-flexion and flexion-extension movements of the right index finger was analyzed in twelve right-handed subjects using electroencephalographic recordings. The amplitude of PMBS over the contralateral sensorimotor area was enhanced and the focus of PMBS was widespread when finger flexion was the last movement. The results suggest that finger extension and flexion movements induce unequal beta synchronization over the contralateral M1 area possibly due to different complexity of the neuronal networks controlling these movements.