It is known that stroking rats can raise the level of oxytocin, a hormone active in the brain and implicated in various social interactions, such as maternal attachment.

• 人们知道，抚摸小老鼠能提升它的催产素的水平。催产素是脑内的一种荷尔蒙，影响着各种社会互动（比如母性依附）。