Fig. 1From: Visual hallucinations in Alzheimer's disease do not seem to be associated with chronic hypoperfusion of to visual processing areas V2 and V3 but may be associated with reduced cholinergic input to these areasAcetylcholine (ACh) is synthesised by choline acetyltransferase (ChAT) and broken down by acetylcholinesterase (AChE) at low concentrations and butyrylcholinesterase (BChE) at higher concentrationsBack to article page