Final answer:
The frontal lobe is responsible for controlling the slow thought processes, personality changes, and emotional lability observed in the patient.
Step-by-step explanation:
Among the various areas of the brain, the frontal lobe is responsible for controlling neuro-cognitive functions such as slow thought processes, personality changes, and emotional lability. The frontal lobe is involved in reasoning, motor control, emotion, and language functions.
It contains the motor cortex, prefrontal cortex and is essential for higher-level cognitive functioning like maintaining attention, decision-making, and assessing risk. Damage to this part of the brain, particularly the prefrontal cortex, can result in the symptoms described in the question.