Key points are not available for this paper at this time.
Alvin M. Liberman, Pierre Delattre, Franklin S. Cooper, The Rôle of Selected Stimulus-Variables in the Perception of the Unvoiced Stop Consonants, The American Journal of Psychology, Vol. 65, No. 4 (Oct., 1952), pp. 497-516
Liberman et al. (Wed,) studied this question.