Torsten Wiesel is a Swedish neurobiologist known for his groundbreaking research in the field of vision. He was awarded the Nobel Prize in Physiology or Medicine in 1981, along with David Hubel, for their work on how the brain processes visual information. Their studies focused on the visual cortex, revealing how neurons respond to visual stimuli. Wiesel's research has significantly advanced our understanding of the brain's structure and function, particularly in relation to sight. He has also contributed to the field of neuroscience through his work in education and advocacy, promoting the importance of scientific research and its applications in medicine.