In:
European Journal of Neuroscience, Wiley, Vol. 27, No. 9 ( 2008-05), p. 2241-2249
Abstract:
Paired associative stimulation (PAS) repeatedly pairs electrical nerve stimulation with transcranial magnetic stimulation of the contralateral motor hand area (M1 HAND ). Depending on the interstimulus interval, PAS can induce a long‐term potentiation (LTP)‐like facilitation or long‐term depression (LTD)‐like suppression of cortical excitability. In three experimental sessions, 12 awake men received PAS of the right median nerve and left M1 HAND in the evening before sleep. To optimize the timing of paired stimulation in M1 HAND , the interstimulus interval of PAS was adjusted to the individual N20‐latency of the somatosensory evoked potential to induce LTP‐like effects (PAS N20+2ms ), LTD‐like effects (PAS N20−5ms ), or no timing‐dependent after‐effects (PAS control ). Motor‐evoked potentials (MEPs) showed high interindividual variations in the conditioning effects of PAS N20+2ms and PAS N20−5ms on cortical excitability. However, PAS control allowed us to adjust for any unspecific stimulation effects and the MEP increase after PAS N20+2ms differed significantly from the MEP decrease after PAS N20−5ms . PAS N20+2ms and PAS N20−5ms also had a differential effect on regional expression of slow waves and slow spindle activity during the first hour of subsequent non‐rapid eye movement (NREM) sleep. At the electrode sites overlying the conditioned M1 HAND and the adjacent premotor cortex, local expression of slow spindle activity was significantly correlated with interindividual differences in the efficacy of PAS N20+2ms and PAS N20−5ms to potentiate or suppress cortical excitability. This correlation indicates that PAS shapes the local regulation of slow sleep spindles during subsequent NREM sleep.
Type of Medium:
Online Resource
ISSN:
0953-816X
,
1460-9568
DOI:
10.1111/ejn.2008.27.issue-9
DOI:
10.1111/j.1460-9568.2008.06178.x
Language:
English
Publisher:
Wiley
Publication Date:
2008
detail.hit.zdb_id:
2005178-5
SSG:
12
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