Closed-Loop Brain Stimulation as a Potential Intervention for Cognitive Decline

Brief Summary

The goal of this clinical study is to investigate the effectiveness of non-invasive stimulation to enhance cognitive control abilities in cognitively healthy adults and older adults diagnosed with mild cognitive disorder (MCI). The main questions it aims to answer are: * whether it is possible to restore various cognitive functions in older adults diagnosed with MCI by delivering theta burst stimulation (TBS), a form of transcranial magnetic stimulation, and * whether closed-loop TBS is able to induce therapeutic benefits that outperform open-loop TBS. Participants play a cognitive video game while a brain-computer interface (BCI) analyzes their electroencephalogram (EEG) signals and decodes the presence or absence of the contingent negative variation (CNV) potential, a marker of cognitive control. The BCI triggers TBS when its outputs indicate that the participant is not engaged properly in the video game. Researchers will compare the effects of sham, closed-loop, and open-loop TBS using the outcome metrics described below to see how much cognitive restorations is achievable with each stimulation modality.