The seat of consciousness
At least two regions of the brain decide what we perceive
The cerebral cortex, i.e. the external part of the brain with its grooves and folds, plays a major role in our consciousness. When macaques see something and consciously perceive it, neurons in the temporal lobes of the cerebral cortex are active. This much was already known. However, is this part of the brain really the sole seat of consciousness, or do other areas of the brain also play a role in this process?
Scientists from the Max Planck Institute in Tübingen measured the activity of neurons in the brains of macaques while the animals observed images on a screen. The results show that neurons in one part of the frontal lobe of the cerebral cortex are active when the monkeys are aware of what they have seen. Therefore, this region of the brain appears to play a role in deciding which impressions reach our consciousness.
Thus the content of consciousness is based in two different brain regions. The decision as to which sensory impressions will reach our consciousness is not made by a single region. Instead, neurons from different regions must cooperate for this purpose. With the help of the tests on the monkeys, it is possible to establish how consciousness arises. This knowledge could benefit people with impaired consciousness in the future.