Evidence map›Paper›PMID 24162796›Full record

ArticleJournal of neural transmission (Vienna, Austria : 1996)2014

Evidence for metaplasticity in the human visual cortex.

Tommaso Bocci, Matteo Caleo, Silvia Tognazzi, Nikita Francini, Lucia Briscese, Lamberto Maffei, Simone Rossi, Alberto Priori, Ferdinando Sartucci

Abstract read
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In one paragraph

Article in Journal of neural transmission (Vienna, Austria : 1996), 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.

0numbers the graph read from it
0cells of the map it votes in
21citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

21 citing papers in PubMed.

  1. Article
  2. Neuroprotection and Non-Invasive Brain Stimulation: Facts or Fiction?International journal of molecular sciences · 2022
    Review
  3. Article
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  14. Review
  15. Article
  16. Article
  17. Article
  18. Low intensity transcranial electric stimulation: Safety, ethical, legal regulatory and application guidelines.Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology · 2017
    Review
  19. Review
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Tommaso BocciUnit of Neurology, Department of Clinical and Experimental Medicine, Pisa University Medical School, Pisa, Italy.
Matteo Caleo
Silvia Tognazzi
Nikita Francini
Lucia Briscese
Lamberto Maffei
Simone Rossi
Alberto Priori
Ferdinando Sartucci

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The threshold and direction of excitability changes induced by low- and high-frequency repetitive transcranial magnetic stimulation (rTMS) in the primary motor cortex can be effectively reverted by a preceding session of transcranial direct current stimulation (tDCS), a phenomenon referred to as "metaplasticity". Here, we used a combined tDCS-rTMS protocol and visual evoked potentials (VEPs) in healthy subjects to provide direct electrophysiological evidence for metaplasticity in the human visual cortex. Specifically, we evaluated changes in VEPs at two different contrasts (90 and 20 %) before and at different time points after the application of anodal or cathodal tDCS to occipital cortex (i.e., priming), followed by an additional conditioning with low- or high-frequency rTMS. Anodal tDCS increased the amplitude of VEPs and this effect was paradoxically reverted by applying high-frequency (5 Hz), conventionally excitatory rTMS (p < 0.0001). Similarly, cathodal tDCS led to a decrease in VEPs amplitude, which was reverted by a subsequent application of conventionally inhibitory, 1 Hz rTMS (p < 0.0001). Similar changes were observed for both the N1 and P1 component of the VEP. There were no significant changes in resting motor threshold values (p > 0.5), confirming the spatial selectivity of our conditioning protocol. Our findings show that preconditioning primary visual area excitability with tDCS can modulate the direction and strength of plasticity induced by subsequent application of 1 or 5 Hz rTMS. These data indicate the presence of mechanisms of metaplasticity that keep synaptic strengths within a functional dynamic range in the human visual cortex.

Indexed as

AdultAnalysis of VarianceBiophysicsElectric StimulationElectroencephalographyEvoked Potentials, VisualFemaleFunctional LateralityHumansMaleNeuronal PlasticityTime FactorsTranscranial Magnetic StimulationVisual CortexYoung Adult

Identifiers

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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.