There is a brain reduce activity in the frontal lobe. The frontal lobe is located at the front of the brain, is the biggest of the four major lobes of the cerebral cortex in the mammalian brain. The frontal lobe can be seen at the front of each cerebral hemisphere (in front of the parietal lobe and the temporal lobe). It is separated from the parietal lobe by a groove between tissues called the central sulcus, and from the temporal lobe by a deeper groove called the lateral sulcus (Sylvian fissure).