It's possible that due to the methodological limitations of Piaget, he systematically underestimated what children and babies know.

皮亚杰很可能由于研究方法上的局限,而系统地低估了婴幼儿的理解能力

耶鲁公开课 - 心理学导论课程节选

From that standpoint, from that theoretical standpoint, comes a methodological approach which is, if they're all the same then you could study human learning by studying nonhuman animals.

从这个理论观点中，可以得出一种研究方法,即，如果人类与动物并无差别,那你就能通过研究非人类动物的学习过程,来研究人类的学习过程。

耶鲁公开课 - 心理学导论课程节选

And in fact, an example of a methodological attempt was done by Henry Gleitman at University of Pennsylvania, who built a tickle machine, which was this box with these two giant hands that went "r-r-r-r."

实际上,宾夕法尼亚大学的亨利·葛雷曼,曾经进行过研究方法上的尝试,他发明了一台挠痒痒的机器,这是一个装有两只大手的箱子,双手会不停的去挠痒痒

耶鲁公开课 - 心理学导论课程节选

There's methodological limitations.

还有些研究方法上的局限

耶鲁公开课 - 心理学导论课程节选