The study of HM shows that the hippocampus plays a key role in transferring information from short-term to long-term memory. But how does the hippocampus actually do this? Like other brain regions, the hippocampus contains many types of neurons that send information to each other by releasing neurotransmitters across synapses. One key neurotransmitter is acetylcholine.In the chapter on the biological approach, you will...