The volunteers were again placed in MRI machines and asked to visualize shapes of certain colors. The participants were asked to somehow regulate activity in the posterior part of the brain to make a solid green disc as large as they could. They were told they would get a paid bonus proportional to the size of this disc, but they werent told anything about what the disc meant. The researchers watched the participants brain activity and monitored the activation patterns in their visual cortices.
Participants can be trained to control the overall mean activation of an entire brain region, the study authors write, or the activation in one region relative to that in another region.
This worked even when test subjects were not aware of what they were learning, the researchers said.
The most surprising thing in this study is that mere inductions of neural activation patterns corresponding to a specific visual feature led to visual performance improvement on the visual feature, without presenting the feature or subjects awareness of what was to be learned, Watanabe said in a statement.
Watanabe and colleagues said this method can be a powerful tool.
It can incept a person to acquire new learning, skills, or memory, or possibly to restore skills or knowledge that has been damaged through accident, disease, or aging, without a persons awareness of what is learned or memorized, they write.
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