Final answer:
The reviewer is likely questioning the construct validity of Dr. Kang's study, which is concerned with the accuracy of the measurement of emotion through exposure to emotional words.
Step-by-step explanation:
The reviewer questioning Dr. Kang's manipulation of emotion in a journal publication is most likely questioning the construct validity of the study. Construct validity refers to the extent to which the study accurately measures the concept or construct it is intended to measure. In this case, the construct is the emotion that is supposed to be manipulated by exposure to emotional words. If the reviewer doubts that emotional words can truly induce emotions, then the very foundation upon which the study is built—the manipulation of the emotional state of participants—is in question, thereby challenging the study's construct validity.