By clusters of brain cells, scientists have discovered that damage to part of the occipital lobe results in a loss of vision.

Lesioning clusters of brain cells is a surgical way of injuring a part of the brain to regain or improve a patient's quality of life or function. Which part of the cells will depend on what disease the patient is struggling from. This might result to damaging other parts of the body, as well as losing the sense of vision.

He used pea plants to study the patterns of heredity.