Using tDCS priming to improve brain function: Can metaplasticity provide the key to boosting outcomes?

Area of Science:

• Neuroscience
• Neuromodulation
• Cognitive Science

Background:

• Transcranial direct current stimulation (tDCS) is widely researched for enhancing brain function.
• Current tDCS protocols often yield variable or insufficient outcomes for clinical application.
• Metaplasticity, where prior stimulation influences subsequent responses, is a key concept.

Purpose of the Study:

• To review the potential of tDCS priming protocols to improve stimulation outcomes.
• To evaluate the efficacy of using tDCS as a priming method before further stimulation.
• To assess the promise of tDCS priming for enhancing neuromodulation benefits.

Main Methods:

• Literature review of studies employing tDCS priming.
• Analysis of protocols involving tDCS followed by a second stimulation period (tDCS or TMS).
• Evaluation of reported outcomes and effect sizes in primed vs. non-primed conditions.

Main Results:

• tDCS priming protocols have shown potential to boost outcomes in some studies.
• Variability in outcomes exists, but improvements are observed compared to non-primed protocols.
• Metaplastic effects are hypothesized to underlie the enhanced responses.

Conclusions:

• tDCS priming demonstrates sufficient promise for enhancing neuromodulation efficacy.
• Further research into tDCS priming protocols is warranted for clinical translation.
• Optimizing tDCS priming may lead to more robust improvements in brain function.