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Publication Detail
Cortical Paired Associative Stimulation Influences Response Inhibition: Cortico-cortical and Cortico-subcortical Networks
  • Publication Type:
    Journal article
  • Publication Sub Type:
  • Authors:
    Kohl S, Hannah R, Rocchi L, Nord CL, Rothwell JC, Voon V
  • Publisher:
  • Publication date:
  • Journal:
    Biological Psychiatry
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  • Keywords:
    Age, Paired associative stimulation, Plasticity, Response inhibition, Stop signal task, Transcranial magnetic stimulation
BACKGROUND: The ability to stop a suboptimal response is integral to decision making and is commonly impaired across psychiatric disorders. Cortical paired associative stimulation (cPAS) is a form of transcranial magnetic stimulation in which paired pulses can induce plasticity at cortical synapses. Here we used cPAS protocols to target cortico-cortical and cortico-subcortical networks by using different intervals between the paired pulses in an attempt to modify response inhibition. METHODS: A total of 25 healthy volunteers underwent four cPAS sessions in random order 1 week apart: right inferior frontal cortex (IFC) stimulation preceding right presupplementary motor area (pre-SMA) stimulation by 10 or 4 ms and pre-SMA stimulation preceding IFC stimulation by 10 or 4 ms. Subjects were tested on the stop signal task along with the delay discounting task as control at baseline (randomized across sessions and cPAS protocol) and after each cPAS session. RESULTS: The stop signal reaction time showed a main effect of cPAS condition when controlling for age (F₃‚₅₇ = 4.05, p = .01). Younger subjects had greater impairments in response inhibition when the pre-SMA pulse preceded the IFC pulse by 10 ms. In older individuals, response inhibition improved when the IFC pulse preceded the pre-SMA pulse by 4 ms. There were no effects on delay discounting. CONCLUSIONS: cPAS modified response inhibition through age-dependent long-term potentiation and depression-like plasticity mechanisms via putative cortico-cortical and cortico-subcortical networks. We show for the first time the capacity for cPAS to modify a cognitive process highly relevant to psychiatric disorders.
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