In the notable study (Libet, Gleason, Wright, & Pearl, 1983) it was shown that movement-preparatory brain activity precedes the reported time of conscious intention to move, which questions the causal role of human being’s decisions in initiating their actions. However, since the study was published, a lot of criticism has been addressed towards it. Thus, Dominik et al. (2017) provided behavioral evidence that the intention reports used in the study of Libet (1983) are invalid, being rather inferred by a participant than truly perceived.

On this experiment we aim to study neural plasticity in the context of cortical excitability using neuromodulatory and neuroexcitatory techniques. We use non invasive brain stimulation techniques (NIBS) aiming for the visual effects called phosphenes and using as reference the measurement of its thresholds.