Specific task anticipation versus unspecific orienting reaction during early contingent negative variation
Objective: To investigate whether a warning stimulus in a forewarned reaction time task elicits only an unspecific orienting reaction or task specific motor cortex activity. Methods: We examined the time-course of alpha event-related desynchronization (ERD) as an indicator for primary motor cortex a...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
10 May 2004
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| In: |
Clinical neurophysiology
Year: 2004, Volume: 115, Issue: 8, Pages: 1836-1845 |
| ISSN: | 1872-8952 |
| DOI: | 10.1016/j.clinph.2004.03.023 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.clinph.2004.03.023 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S1388245704001348 
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| Author Notes: | Stephan Bender, Franz Resch, Matthias Weisbrod, Rieke Oelkers-Ax |
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| 520 | |a Objective: To investigate whether a warning stimulus in a forewarned reaction time task elicits only an unspecific orienting reaction or task specific motor cortex activity. Methods: We examined the time-course of alpha event-related desynchronization (ERD) as an indicator for primary motor cortex activation in an auditory contingent negative variation (CNV) paradigm with an interstimulus interval of 3 s in healthy subjects between 6 and 18 years using a 64 channel high-density sensor array. Results: We replicated a wide frontal distribution for the initial CNV component (iCNV), while only during late CNV (lCNV) a centro-parietal negativity resembling the ‘Bereitschaftspotential’ occurred. However, an early alpha-ERD over the central area contralateral to the side of the response movement followed the imperative stimulus already during the iCNV-interval. This early alpha-ERD was highly significantly lateralised and was even more prominent during iCNV than during lCNV indicating an activation of the contralateral sensorimotor cortex already during iCNV. Conclusions: We conclude that early task specific preparatory motor processes (which might reflect the retrieval of a motor program from memory) were elicited by the warning stimulus. These preparatory processes clearly exceeded an unspecific orienting reaction as early alpha-ERD was influenced by the side of the anticipated movement. | ||
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