Massaro, D. W. (1969). A Three State Markov Model for Discrimination Learning. Journal of Mathematical Psychology, 6(1), 62-80. Massaro, D. W. (1969). The Role of the Decision System in Sensory and Memory Experiments Using Confidence Judgments. Perception and Psychophysics, 5(5), 270-272. Massaro, D. W. (1969). The Effects of Feedback in Psychophysical Tasks. Perception and Psychophysics, 6(2), 89-91.