 Can't mistake his body rhythm," when Dr. P. is watching television) and added documentary segments with Sacks and pathologist John Tighe working with the actual Dr. P.'s brain.They reveal that his condition was the result of Alzheimer's Disease that atypically affected only one portion of his brain until its latter stages.Unusually for an opera film not shot on a theatre stage, the singing was recorded live on-set by boom operators.