What part of your brain controls all mental activities? cerebellum medulla cerebrum brain stem?

Cerebrum

It is the largest part of the brain and it is divided into two spheres. The outer most layer of the cerebrum is the cortex which has four lobes the frontal, parietal, temporal and occipital. The cerebral cortex is considered as the seat of complex thought. Visual processing takes place in the occipital lobe and near the posterior area of the skull. The temporal lobe processes sound and language, hippocapus and amygdala play roles in memory and emotion. The parietal lobe integrates the input from various senses.