Dr. Arvid Carlsson received the Nobel Prize in 2000 along with Drs. Paul Greengard and Eric Kandel for their discoveries concerning “signal transduction in the nervous system”. Arvid Carlsson discovered the neurotransmitter dopamine in the brain. Other discoveries were to provide the first indications that dopamine mediated the antiparkinsonian actions of levodopa and that blockade of DA receptors mediated the antipsychotic actions of neuroleptics in the treatment of schizophrenia. These discoveries were made in the 1950s and early 1960s. …