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  Motor and phosphene thresholds: consequences of cortical anisotropy

Kammer, T., Beck, S., Puls, K., Roether, C., & Thielscher, A. (2003). Motor and phosphene thresholds: consequences of cortical anisotropy. Supplements to Clinical Neurophysiology, 56: 19, 198-203.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-8A90-E Version Permalink: http://hdl.handle.net/21.11116/0000-0003-8A91-D
Genre: Conference Paper

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 Creators:
Kammer, T1, 2, Author              
Beck, S, Author
Puls, K, Author
Roether, C, Author
Thielscher, A, Author              
Affiliations:
1Former Department Comparative Neurobiology, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497800              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: This chapter directly compares the current direction effect of monophasic pulses on thresholds in the visual and motor system using two different stimulator types. With a frameless stereotactic positioning system, the chapter demonstrates a dependency of phosphene maps from the visual cortex on current direction. Phosphene mapping revealed that stimulation sites evoking phosphenes bilaterally in the left and right visual field depend on the induced current direction. Under the assumption that the generator of a unilateral phosphene sits in the contralateral hemisphere bilateral phosphenes require a suprathreshold stimulation of both occipital lobes. The shift of the border from bilateral to unilateral stimulation can be directly explained because of threshold differences. The suprathreshold stimulation of the hemisphere stimulated in the preferred current direction still works with a coil position shifted over the nonpreferred hemisphere.

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 Dates: 2003-06
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/S1567-424X(09)70222-3
 Degree: -

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Title: 2nd International Transcranial Magnetic Stimulation (TMS 2003) and Transcranial Direct Current Stimulation (tDCS) Symposium
Place of Event: Göttingen, Germany
Start-/End Date: 2003-06-11 - 2003-06-14

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Title: Supplements to Clinical Neurophysiology
Source Genre: Journal
 Creator(s):
Paulus, W, Editor
Thergau, F, Editor
Nitsche, MA, Editor
Rothwell, JG, Editor
Ziemann, U, Editor
Hallett, M, Editor
Affiliations:
-
Publ. Info: -
Pages: 452 Volume / Issue: 56 Sequence Number: 19 Start / End Page: 198 - 203 Identifier: ISSN: 567-424X