A new temporal window for inducing depressant associative plasticity in human primary motor cortex
A new temporal window for inducing depressant associative plasticity in human primary motor cortex
复制标题
诱导人类初级运动皮层抑制联想可塑性的新时间窗口
DOI:
10.1016/j.clinph.2013.01.004
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发表时间:
2013
影响因子:
4.7
通讯作者:
Classen
中科院分区:
文献类型:
--
作者:
Schabrun;Ridding;Classen
OBJECTIVESpike-timing dependent plasticity (STDP) usually refers to synaptic plasticity induced by near-synchronous activation of neuronal input and neuronal firing. However, some models of STDP predict effects that deviate from this tight temporal synchrony. We aimed to characterise the induction of STDP using paired associative stimulation (PAS) when the pre-synaptic input arrives in primary motor cortex (M1) at (i) intermediate intervals (50–80ms; PAS50,..PAS80) before the post-synaptic neuron is activated and (ii) long intervals (100–450ms; PAS−100,..PAS−450) after the post-synaptic neuron is activated. PAS at near-synchronicity (PAS25) was applied for comparison.METHODSTo characterise the physiological effects of the different PAS protocols, we examined short- and long-interval intra-cortical inhibition; intra-cortical facilitation and short- and long-latency afferent inhibition, in addition to recording MEPs in 45 healthy individuals.RESULTSMEP amplitude was reduced at PAS intervals between −250 and −450ms, increased with PAS25, and unaltered at the remaining intervals. There was no change in intra-cortical inhibitory or facilitatory circuits following any PAS protocol.CONCLUSIONSThese findings provide evidence of a previously unreported temporal window in which PAS induces a depression of corticospinal excitability in human M1.SIGNIFICANCEEstablishing new temporal rules for STDP broadens its applicability for therapeutic usage in future.
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作者:
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通讯作者:
Hallett,Mark
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W. Paulus
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Tonali, P. A.
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Rektor, I
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Voller,Bernhard;StClairGibson,Alan;Lomarev,Mikhail;Kanchana,Sulada;Dambrosia,James;Dang,Nguyet;Hallett,Mark
通讯作者:
Hallett,Mark