Key points are not available for this paper at this time.
David A. Snow, E. Burke Rochford, Jr., Steven K. Worden, Robert D. Benford, Frame Alignment Processes, Micromobilization, and Movement Participation, American Sociological Review, Vol. 51, No. 4 (Aug., 1986), pp. 464-481
Snow et al. (Fri,) studied this question.