Luce, T. S., & Volksdorf, N. R. (1973). Beware of relevance in higher education. American Psychologist, 28(4), 355-356.
http://dx.doi.org/10.1037/h0038087
Examined the effects of exposure to a course dealing with the environment on 61 undergraduates' awareness of environmental events. Ss initially were significantly more aware of environmental events than were 247 undergraduate controls. However, this initial advantage decreased over the course period to a level of awareness that was less than that of controls. (PsycINFO Database Record (c) 2016 APA, all rights reserved)