These studies have a number of weakness that would be worthwhile to address in future work. The first is that, ...
A second important weakness is that ....
An additional weakness in our research is that ....
Further, this study used laboratory methods of assessing the accuracy of emotion recognition that differe substantially from the natural process as it occurs outside of the laboratory.
なんか、実験心理学に文句つけられた場合の教科書的回答が笑えます(そして、使えます!)。
出典:Elfenbein, H. A., & Ambady, N. (2003). When familiarity breeds accuracy: Cultural exposure and facial emotion recognition. Journal of Personality and Social Psychology, 85, 276-290.