Evidence map›Paper›PMID 34782626›Full record

ArticleScientific reports2021

Amplitude modulated transcranial alternating current stimulation (AM-TACS) efficacy evaluation via phosphene induction.

Carsten Thiele, Tino Zaehle, Aiden Haghikia, Philipp Ruhnau

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed
1.6field-weighted citation impact, top 17% of its field
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

15 citing papers in PubMed, 26 citations in OpenAlex.

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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

4 authors at 3 institutions in 1 country.

Carsten ThieleDepartment of Neurology, Otto-Von-Guericke-Universität, Universitätsklinikum Magdeburg, Leipziger Str. 44, 39120, Magdeburg, Germany. carsten.thiele@med.ovgu.de.
Tino ZaehleDepartment of Neurology, Otto-Von-Guericke-Universität, Universitätsklinikum Magdeburg, Leipziger Str. 44, 39120, Magdeburg, Germany.
Aiden HaghikiaDepartment of Neurology, Otto-Von-Guericke-Universität, Universitätsklinikum Magdeburg, Leipziger Str. 44, 39120, Magdeburg, Germany.
Philipp RuhnauDepartment of Neurology, Otto-Von-Guericke-Universität, Universitätsklinikum Magdeburg, Leipziger Str. 44, 39120, Magdeburg, Germany.
University Hospital Magdeburg · DECenter for Behavioral Brain Sciences · DEGerman Center for Neurodegenerative Diseases · DE

Funding

Deutsche Forschungsgemeinschaft ZA 626/2-1European Regional Development Fund ZS/2016/04/78113
6 · The paper itself

Abstract

Amplitude modulated transcranial alternating current stimulation (AM-tACS) is a novel method of electrostimulation which enables the recording of electrophysiological signals during stimulation, thanks to an easier removable stimulation artefact compared to classical electrostimulation methods. To gauge the neuromodulatory potential of AM-tACS, we tested its capacity to induce phosphenes as an indicator of stimulation efficacy. AM-tACS was applied via a two-electrode setup, attached on FpZ and below the right eye. AM-tACS waveforms comprised of different carrier (50 Hz, 200 Hz, 1000 Hz) and modulation frequencies (8 Hz, 16 Hz, 28 Hz) were administered with at maximum 2 mA peak-to-peak stimulation strength. TACS conditions in the same frequencies were used as a benchmark for phosphene induction. AM-tACS conditions using a 50 Hz carrier frequency were able to induce phosphenes, but with no difference in phosphene thresholds between modulation frequencies. AM-tACS using a 200 Hz or 1000 Hz carrier frequency did not induce phosphenes. TACS conditions induced phosphenes in line with previous studies. Stimulation effects of AM-tACS conditions were independent of amplitude modulation and instead relied solely on the carrier frequency. A possible explanation may be that AM-tACS needs higher stimulation intensities for its amplitude modulation to have a neuromodulatory effect.

Indexed as

PhosphenesTranscranial Direct Current StimulationAdultAlgorithmsBiomarkersBrainBrain WavesFemaleHumansMaleModels, TheoreticalNeuronsYoung AdultBiomarkers

Identifiers

PMID34782626
PMCPMC8593032
OpenAlexW3212960923

What OpenQuestion holds

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LicenceCC BY
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Registered trials

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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.