  In individuals afflicted with conditions such as paralysis, the
implementation of Brain-Computer-Interface (BCI) has begun to significantly
impact their quality of life. Furthermore, even in healthy individuals, the
anticipated advantages of brain-to-brain communication and brain-to-computer
interaction hold considerable promise for the future. This is attributed to the
liberation from bodily constraints and the transcendence of existing
limitations inherent in contemporary brain-to-brain communication methods. To
actualize a comprehensive BCI, the establishment of bidirectional communication
between the brain and the external environment is imperative. While neural
input technology spans diverse disciplines and is currently advancing rapidly,
a notable absence exists in the form of review papers summarizing the
technology from the standpoint of the latest or potential input methods. The
challenges encountered encompass the requisite for bidirectional communication
to achieve a holistic BCI, as well as obstacles related to information volume,
precision, and invasiveness. The review section comprehensively addresses both
invasive and non-invasive techniques, incorporating nanotech/micro-device
technology and the integration of Artificial Intelligence (AI) in brain
stimulation.
