Neurofeedback shows promise in treating tinnitus -- ScienceDaily
The participants then participated in the fMRI-neurofeedback training phase while inside the MRI scanner. They received white noise through their earplugs and were able to view the activity in their primary auditory cortex as a bar on a screen. Each fMRI-neurofeedback training run contained eight blocks separated into a 30-second "relax" period followed by a 30-second "lower" period. Participants were instructed to watch the bar during the relax period and actively attempt to lower it by decreasing primary auditory cortex activity during the lower phase.
The researchers gave the participants techniques to help them do this, such as trying to divert attention from sound to other sensations like touch and sight.
"Many focused on breathing because it gave them a feeling of control," Dr. Sherwood said. "By diverting their attention away from sound, the participants' auditory cortex activity went down, and the signal we were measuring also went down."
A control group of nine individuals were provided sham neurofeedback -- they performed the same tasks as the other group, but the feedback came not from them but from a random participant. By performing the exact same procedures with both groups using either real or sham neurofeedback, the researchers were able to distinguish the effect of real neurofeedback on control of the primary auditory cortex.
The study represents the first time fMRI-neurofeedback training has been applied to demonstrate that there is a significant relationship between control of the primary auditory cortex and attentional processes. This is important to therapeutic development, Sherwood said, as the neural mechanisms of tinnitus are unknown but likely related to attention.