Feedback is the essence of neurofeedback (not to be funny, but it’s basically the name—feedback for brain cells is neurofeedback). Too often, though, it’s confusing to people even after they’ve begun training and are experiencing it for themselves, so I thought I’d try to explain what feedback is.
If you’ve been reading the copy on my website or anyone else’s who does neurofeedback, you know that the process of doing brain training involves attaching sensors that we call electrodes to the scalp. These sensors pick up the very faint electrical signal that the brain gives off and makes its way through the bones of our skull.
The sensors then send the information to an amplifier. The amplifier’s job is literally to amplify the signal so that the computer software can detect and use the signal.
The computer software receives and filters the signal, then processes it through programs that feed back to the brain what it is doing. It gives a signal that something is going well and is always, always reward-based, meaning that the brain gets some kind of reward for going in the direction the computer software is programmed to reward it for going. So, feedback is basically a reward that tells the brain it’s doing a good job.
This feedback can occur in many ways.
The earliest feedback was just watching the software’s display screen as it projects the signal into bar graphs called bins, or a spectrogram, or one of several other ways of graphically representing the electrical signal. Trainees were asked to try to modify what they saw on the screen. It worked, but whew, was it tedious.
Even though I don’t ask clients to do this type of work, I do keep my screen—the software screen that shows what’s happening—in the line of sight so that people doing training can see in real time a graphic representation of what their brain is doing.
The field evolved beyond using a simple screen in to providing audio and visual feedback.
Audio feedback often comes in the form of tones that play when the software detects that the brain’s electrical patterns are moving in the direction the software is programmed to make it go. These tones are novel to the brain, so it tries to make sense of them.
This part is difficult for many to understand: the MIND does not need to be involved in the process of understanding the tones, because the neurons in the brain are themselves working at an unconscious level to make sense of what the brain is hearing.
Believe me, that is a relief—knowing what all those tones are doing and why would be overwhelming!
Music or other forms of continuous feedback also are used. This is a gentler form of feedback, and it often involves the sound getting louder or quieter, depending upon what the brain is doing.
Visual feedback comes in many ways. Usually the software is set to make the trainee’s computer screen go darker or lighter, depending upon what the brain is doing. With people who are exceptionally stressed, the visual on the screen may simply be the computer wallpaper, and as they progress, we set the wallpaper image to change every minute or so. The wallpaper fades in and out as the brain approaches, then recedes from its training goals.
Most people will use video of some sort for their visual feedback, and the video will get lighter or darker (and sometimes louder or quieter) depending upon what the brain is doing.
Finally, there are video games. The feedback to let the brain know what is happening and how it might change is usually a complicated combination of visual and audio, with the game moving faster or slower, targets being reached, etc. It depends upon the game and how it is set up. There is usually a scoring mechanism involved in games, so the mind is getting some feedback, too.
Regardless of whether the feedback is audio, visual, or gamified, it is all basically holding up a mirror to the brain so that it can see what is happening, then offering an “atta-boy!” in the form of reward every time the brain moves even in a small amount toward the desired goal.
Feedback is pleasant. The tones tend to fade into the background of one’s awareness while training with eyes open. If one is training with eyes closed, the tones become almost musical and are quite relaxing.
It is never necessary to understand or analyze the feedback. In fact, trying to create feedback often paradoxically gets in the way of the brain doing what it needs to do. Children tend to grasp this concept better than adults; they go with the flow and just allow feedback to happen.
Feedback is also usually quite gentle, especially when the goal is calming. Feedback may be harder to achieve when we’re trying to make the brain use more energy to do something, but it is still gentle.
If you choose to try neurofeedback, I encourage you, too, just to go with the flow and allow the process to happen. The brain knows what to do with what it is being shown.