Two-way active avoidance tested in postnatal hypoxic males and females (P36-43) revealed that, IH-2w(or 4w) at 5 km impaired male learning or memory, while IH-lw at 5 km impaired female learning.

• 对于出生后4周低氧小鼠在P36天进行研究发现:与对照组比较,电镜显示,4周2千米和5千米低氧明显增加小鼠海马CA3区突触数目。