Answer:
Occipital lobe.
Step-by-step explanation:
Occipital lobe may be defined as one of the most important lobe of the body among all other lobes of the brain. This region is mainly involved in the visual cortex of the body.
Sammy research is based on the visual impaired elderly man. The Sammy should place the electrodes near the occipital lobe of the brain. As this region of brain is mainly involved in the visual fields of the body.
Thus, the answer is occipital lobe.