Methods:Aging rats was used for dementia model,the learning and memory change was detected by step-down tests,and the content of GABA was determined by spectrophotography.

• 方法:采用老年大鼠作为拟痴呆动物模型,用跳台法测试大鼠学习记忆能力,用分光光度法测定脑内GABA含量,用毛细管法测定全血比粘度、血浆粘度和红细胞压积。