Transcranial brain stimulation (tDCS/tACS)
Example publications:
Javadi, A. H., Glen, J. C., Halkiopoulos, S., Schulz, M., & Spiers, H. J. (2017). Oscillatory Reinstatement Enhances Declarative Memory. Journal of Neuroscience
Javadi, A. H., Brunec, I. K., Walsh, V., Penny, W. D., & Spiers, H. J. (2014). Transcranial electrical brain stimulation modulates neuronal tuning curves in perception of numerosity and duration. Neuroimage