(1/3) Arvid Carlsson - Born in Uppsala, Sweden, he earned his medical degree at the University of Lund in Sweden. Through his research, he found that dopamine (a chemical that helps neurons communication in the brain), is concentrated in the area of the brain that controls movement, an idea not previously accepted by scientists. This later helped in research into diseases like Parkinsons disease. For his discovery he received a portion of the Nobel Prize for Medicine in 2000. (1/3) Paul Greengard - Born in New York City, he earned his doctoral degree in biophysics at Johns Hopkins University. He concentrated on the stages of the dopamine transfer to a receptor and the process in which this takes place. This later helped in research into diseases like Parkinsons disease. For his discovery he received a portion of the Nobel Prize for Medicine in 2000. (1/3) Eric R. Kandel - Born in Vienna, Austria, he earned his medical degree at the New York University School of Medicine in New York City. He studied the memories of snails by introducing stimuli like a mild electrical shock. These experiments later helped in research into diseases like Parkinsons disease. For his discovery he received a portion of the Nobel Prize for Medicine in 2000.