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Updated: Apr 19, 2026
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Transcranial Direct Current Stimulation and Simultaneous Functional Magnetic Resonance Imaging
Published on: April 27, 2014
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Cognitive effects and autonomic responses to transcranial pulsed current stimulation
Leon Morales-Quezada1, Camila Cosmo, Sandra Carvalho
1Spaulding Neuromodulation Center, Spaulding Rehabilitation Hospital, Harvard Medical School, 79/96 13th Street, Charlestown, Boston, MA, USA.
Experimental Brain Research
|December 7, 2014
Summary
Transcranial pulsed current stimulation (tPCS) modestly enhanced complex math performance in healthy adults. This neuromodulation technique also influenced autonomic responses, suggesting a sympathetic-vagal balance during cognitive tasks.
Area of Science:
- Neuromodulation and Cognitive Neuroscience
Background:
- Transcranial pulsed current stimulation (tPCS) is an emerging neuromodulation technique.
- Limited understanding exists regarding tPCS effects on cognition, behavior, and autonomic responses.
Purpose of the Study:
- To investigate the impact of tPCS on arithmetic processing and risk-taking behavior.
- To characterize neurophysiological autonomic correlates using heart rate variability (HRV) and electrodermal activity.
Main Methods:
- 30 healthy volunteers received a single session of either sham or active tPCS (2 mA, 1-5 Hz random frequency).
- Cognitive tasks, HRV, and electrodermal activity were measured before, during, and after stimulation.
- Participants were randomized to active or sham tPCS groups.
Main Results:
- Active tPCS showed a modest facilitation in complex arithmetic task performance compared to sham.
- tPCS increased HRV total power and decreased the LF/HF ratio, indicating autonomic nervous system modulation.
- No significant differences in adverse effects were reported between groups.
Conclusions:
- tPCS demonstrates a modest, specific cognitive effect, particularly in facilitating complex arithmetic processing in healthy individuals.
- These cognitive effects are associated with autonomic nervous system modulation, promoting sympathetic-vagal balance under stress.
- Findings contribute to understanding tPCS for cognitive enhancement and its physiological underpinnings.
