The brain is highly complex, and although neurotech is advancing at a rapid rate, it may yet be some time before our technology can not only develop the finesse to access the correct segments of the brain, but also to correctly interpret the chemical and electromagnetic reactions there. However, once the technology is developed and sufficiently advanced, there should be no harmful effects to the brain. The neural receptors would only need to access the most remote regions of the brain, and information could in no way be...

The brain is highly complex, and although neurotech is advancing at a rapid rate, it may yet be some time before our technology can not only develop the finesse to access the correct segments of the brain, but also to correctly interpret the chemical and electromagnetic reactions there. However, once the technology is developed and sufficiently advanced, there should be no harmful effects to the brain. The neural receptors would only need to access the most remote regions of the brain, and information could in no way be gathered from this. The inner regions of the brain are those that control the complex psyche of the human. It is the outer regions of the brain that control the rest of the nervous system and control movement and external thoughts.

Trying to put a long-term implant in the motor cortex of the brain of a quadriplegic person and then trying to capture movement-related operating signals from the brain and send those to a computer. The electrode implant, he said, can take detailed signals from the brain; that information, in the form of analog waveforms, is then turned into digital signals that are used to dictate motion, so that, by thinking about moving the cursor on a computer, the quadriplegic can actually do so. It improves people's lives by suppo...

Trying to put a long-term implant in the motor cortex of the brain of a quadriplegic person and then trying to capture movement-related operating signals from the brain and send those to a computer. The electrode implant, he said, can take detailed signals from the brain; that information, in the form of analog waveforms, is then turned into digital signals that are used to dictate motion, so that, by thinking about moving the cursor on a computer, the quadriplegic can actually do so. It improves people's lives by supporting fundamental research in the neuro-muscular sciences,
Developing safe and effective neurotechnology will depend on continued advances in biochips and brain imaging technologies

This is a tough question, you should read (The last book in the universe) it is exactly about what you want answered.