期刊
CLINICAL NEUROPHYSIOLOGY
卷 112, 期 10, 页码 1868-1874出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/S1388-2457(01)00622-8
关键词
nociception; TmYAG laser; laser evoked potentials; scalp topography; reaction time; C-fibres
Aim: To investigate (1) the scalp topography of ultralate laser evoked potentials (LEPs) related to C-fibre activation, which can directly be obtained by thulium YAG (Tin YAG) laser stimulation of tiny skin surface areas (about 0.23 mm(2)) and (2) the influence of the performance of a motor task on ultralate LEPs. Methods: Laser stimuli were applied to the dorsum of the left hand. LEPs were recorded with 58 scalp electrodes from 9 healthy subjects in two different conditions, with and without a reaction time (RT) task (press a button upon detection). Results: On high resolution electroenchephalogram recordings, ultralate LEPs were characterized by a broad positive component (peak latency: 1133 +/- 91 ms) with maximum amplitude about the vertex. Moreover, the performance of a RT task had no influence on latency, amplitude and topographical patterns of two maps chosen at the positive peak latency in ultralate LEPs. Nevertheless, a negative inflexion (latency 1300 ms) appeared after the positive component in the task condition possibly reflecting movement-related potentials. Conclusion: Tm YAG laser stimulation of tiny skin surface areas allows recording the dynamic scalp topography of ultralate (C-fibres) LEPs, With or without the performance of a RT task. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.
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