Paired-pulse behavior of visually evoked potentials recorded in human visual cortex using patterned paired-pulse stimulation.

Experimental Brain Research
Oliver HöffkenM Bach

Abstract

Paired-pulse stimulation techniques are used as common tools to investigate cortical excitability and cortical plastic changes. Similar to investigations in the somatosensory and motor system here we applied a new paired-pulse paradigm to study the paired-pulse behavior of visually evoked potentials (VEPs) in 25 healthy subjects. VEPs were recorded and the responses to the first and the second P100 peak were analyzed at different SOAs [stimulus onset asynchrony (SOA) = interstimulus interval (ISI) + pulse duration (13 ms)]. Two measures describe the paired pulse interaction: the "amplitude ratio", the ratio of the second to the first amplitude, and the "latency shift", the difference of the inter-peak interval between the P100 peaks and the respective SOA. To separate alterations in the amplitude of the second VEP response due to changes in paired-pulse inhibition from those originating from superposition of the two waveforms, particularly at short SOAs, we created a waveform template from recordings made at SOAs of 1 s, where interaction can be assumed to be negligible. Superposed traces of VEP recordings were then created by adding two templates at delays corresponding to the SOAs used. The original recordings were then digit...Continue Reading

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Citations

Feb 16, 2012·Epilepsia·Gionata StrigaroRoberto Cantello
Jun 19, 2009·Fiziologiia cheloveka·E S MikhaĭlovaA V Ovsienko
Feb 11, 2011·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Roberto CantelloFrancesco Monaco
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Nov 9, 2021·Brain Topography·Nobuyuki TakeuchiKoji Inui

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