Garrigan, P., & Kellman, P. J. (2004). Is Perceptual Learning Constrained to Operate Through Perceptual (Not Sensory) Representations? [Abstract]. Journal of Vision, 4(8), 305a, http://journalofvision.org/4/8/305/, doi:10.1167/4.8.305.
Vision Sciences Society Meeting, 2004: Abstracts
http://journalofvision.org/4/8/305/