Researchers at Virginia Tech have found that neurofeedback can increase the signal-to-noise ratio in our thoughts, and this increase can be detected on fMRI. In new research published in the Proceedings of the National Academy of Sciences, the researchers had study participants engage in a neurofeedback task where they had to control a needle on a computer screen using only their thoughts. When the participants were actively controlling the needle with their thoughts, the fMRI showed sharper, more intense brain activity and less "white noise" than compared to study participants who merely observed the needle. These results could help researchers develop better neurofeedback techniques to help people recover from a variety of neurological injuries.
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Journal article: Brain–computer interfaces increase whole-brain signal to noise.