Brain controls 'what the eyes see'

Vase or face? When presented with the well known optical illusion in which we see either a vase or the faces of two people, what we observe depends entirely on changes that occur in our brain. Researchers in the United States have found that when viewing ambiguous images like optical illusions, patterns of neural activity within specific brain regions systematically change as perception changes, BBC radio reported.
The fact that some brain areas show the same pattern of activity when we view a real image and when we interpret an ambiguous image in the same way implicates these regions in creating the conscious experience of the object that is being viewed.
In fact, Serences of the University of California and his fellow researchers came to the conclusion after measuring patterns of neural activity in the middle temporal region of the brain in a group of people under two scenarios, using functional magnetic resonance imaging.