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Behavioral Validation of Individualized Low-Intensity Transcranial Electrical Stimulation (tES) Protocols
Rajat Joshi1,2, Sainath Murali1,2, Nivethida Thirugnanasambandam3,2
1National Brain Research Centre (NBRC), Manesar 122 052, India.
Eneuro
|December 22, 2023
Summary
Individualizing transcranial electrical stimulation (tES) dose reduced electric field variability but did not significantly improve behavioral outcomes in motor learning or working memory tasks. Further research is needed to optimize tES protocols.
Area of Science:
- Neuroscience
- Neuromodulation
- Cognitive Science
Background:
- Interindividual variability in transcranial electrical stimulation (tES) effects limits clinical use.
- Individualizing tES dose based on anatomy may reduce electric field (E-field) variability and improve outcomes.
Purpose of the Study:
- To empirically evaluate the behavioral effects of individualized dose tES.
- To compare individualized dose tES with fixed dose and sham tES.
Main Methods:
- Single-blinded, sham-controlled, repeated-measures study with 42 healthy adults.
- Examined transcranial direct current stimulation for motor learning and transcranial alternating current stimulation for working memory.
- Participants received fixed dose, individualized dose, or sham tES during behavioral tasks.
Main Results:
- Individualized dose tES successfully reduced E-field variability at targeted cortical surfaces.
- No significant improvements in behavioral outcomes were observed for individualized dose tES compared to sham or fixed dose.
Conclusions:
- While individualizing tES dose affects E-field distribution, it does not guarantee behavioral improvements.
- The relationship between E-fields and behavior is complex, requiring further investigation into neuroanatomical and functional factors for tES protocol optimization.
