Methods Five neuropsychological tests and SPECT were performed in 30 normal aged(NA), 30 AD and 31 PD to compare the difference on cognitive functions and cerebral perfusion.

• 方法对30例正常老人（NA），30例AD和31例PD进行神经心理学测验和SPECT检查，比较三组认知功能和脑血流灌注特点。