Is it that surprising that inhibiting choline would be a bad idea? Choline's positive effects on memory and the brain are very well known and increases in acetylcholine are one of the main methods of actions of nootropics in the racetam class.
Comparative studies on the effects of the nootropic drugs adafenoxate, meclofenoxate and piracetam, and of citicholine on scopolamine-impaired memory, exploratory behavior and physical capabilities (experiments on rats and mice).
http://www.ncbi.nlm.nih.gov/pubmed/3136617
Profound effects of combining choline and piracetam on memory enhancement and cholinergic function in aged rats. http://www.ncbi.nlm.nih.gov/pubmed/7301036
Effects of citicholine and of the combination citicholine + piracetam on the memory (experiments on mice). http://www.ncbi.nlm.nih.gov/pubmed/2392950
Comparative studies on the effects of the nootropic drugs adafenoxate, meclofenoxate and piracetam, and of citicholine on scopolamine-impaired memory, exploratory behavior and physical capabilities (experiments on rats and mice). http://www.ncbi.nlm.nih.gov/pubmed/3136617