Study's lead author Caspar Schwiedrzik from the Max Planck Institute for Brain Research in Germany said the brain is an organ that continuously adapts to its environment and can be taught to improve visual perception.
"A question that had not been tackled until now was whether a hallmark of the human brain, namely its ability to produce conscious awareness, is also trainable," Schwiedrzik said.
"Our findings imply that there is no fixed border between things that we perceive and things that we do not perceive - that this border can be shifted," Schwiedrzik added.
For the study, the researchers showed subjects with normal vision two shapes, a square and a diamond, one immediately followed by a mask. The subjects were asked to identify the shape they saw.
The first shape was invisible to the subjects at the beginning of the tests, but after 5 training sessions, subjects were better able to identify both the square and the diamond.
The ability to train brains to consciously see might help people with blindsight, whose primary visual cortex has been damaged through a stroke or trauma.
Blindsight patients cannot consciously see, but on some level their brains process their visual environment.
Schwiedrzik said the new research may help blindsight patients gain conscious awareness of what their minds can see, and he suggested that new research should address whether the brains in blindsight patients and people with normal vision process the information the same way.
"Our study suggests that it might in principle be possible for blindsight patients to recover some visual awareness, and thus our findings might open a venue for a new line of research and potential treatments for patients with acquired cortical blindness," Schwiedrzik said.
The study has been published in the Journal of Vision.