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Evidence for associative plasticity in the human visual cortex.

Federico Ranieri1, Gianluca Coppola2, Gabriella Musumeci3

  • 1Research Unit of Neurology, Neurophysiology and Neurobiology, Università Campus Bio-Medico, Roma, Italy; NeXT: Neurophysiology and Neuroengineering of Human-Technology Interaction Research Unit, Università Campus Bio-Medico, Roma, Italy; Fondazione Alberto Sordi-Research Institute for Aging, Roma, Italy.

Brain Stimulation
|February 19, 2019
PubMed
Summary
This summary is machine-generated.

Human visual cortex plasticity can be modified by paired associative stimulation. This study demonstrates that visual paired associative stimulation (vPAS) can induce long-term changes in visual cortex excitability, similar to synaptic plasticity in other brain regions.

Keywords:
PlasticitySpike timingTranscranial magnetic stimulationVisual cortexVisual evoked potential

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Area of Science:

  • Neuroscience
  • Human visual system plasticity
  • Synaptic plasticity

Background:

  • Convergent inputs to neurons can cause long-term potentiation (LTP) or depression (LTD).
  • This synaptic plasticity is dependent on spike timing.

Purpose of the Study:

  • To investigate spike-timing-dependent plasticity in the human visual cortex.
  • To induce persistent changes in the primary visual cortex (V1) using visual paired associative stimulation (vPAS).

Main Methods:

  • Coupled transcranial magnetic stimulation (TMS) with peripheral visual stimuli.
  • Used four interstimulus intervals (-50, -25, +25, +50 ms) relative to the visual evoked potential (VEP) P1 latency.
  • Analyzed VEP amplitude and delayed habituation before and after vPAS.

Main Results:

  • vPAS+25 reduced VEP amplitude.
  • vPAS-25 increased delayed VEP habituation.
  • vPAS+25 decreased delayed VEP habituation.

Conclusions:

  • Demonstrates associative, bidirectional synaptic plasticity in the human visual system.
  • Suggests V1 exhibits plasticity rules similar to sensorimotor systems.