MidBrain (Interbrain) has to be awakened by stimulating a hormonal discharge. In the human body, it is the pituitary gland that regulates the hormone secretions and this function has to be awakened. For this, it is necessary to activate the neighboring Pineal Gland. The pineal body secretes two hormones: Melatonin and Serotonin.
The secretion of Melatonin increases in the dark and decreases when it is bright..
Serotonin is said to be very closely related to the evolution of species and has the capacity to increase the intelligence of the right brain. Since the MidBrain is responsible for communication with the left and right hemispheres of the brain, the process of "Activating the MidBrain" will result in better communication with the left and right hemispheres.
As individuals grow older, the brain has the tendency to automatically assign one hemisphere of the brain to become more dominant in performing certain task (a process known as Lateralization). This means we end up using much less of our brain that we actually could! The process of activating the MidBrain reverses this trend and allows us to use our brain more efficiently, hence the improvement in cognitive abilities.
Another interesting effect of MidBrain activation that it allows children to sense the visual properties of objects without actually seeing them with their eyes (blindfolded).