The frontal lobe is responsible for higher order thinking and behavioral inhibition. Lesions in this area can cause people to undergo extreme personality changes and lose behavioral inhibitions. Apathy is also common. The occipital lobe at the back of the brain is responsible for collecting and integrating visual stimuli. A tumor here could cause visual disturbances. Lesions in the temporal lobe can cause trance-like states, memory disturbances, and mood symptoms. Neoplasms in the parietal lobe can impair speech, writing ability, object recognition, and spatial abilities.