Table 1.

Transition probability diagram

First tone Neutral (p = 0.33)Second tone
Expected (p = 0.75)Unexpected (p = 0.25)
Stimulus 1 (N = 200)Repetition (stimulus 1) (N = 150)Omission (no stimulus) (N = 50)
Stimulus 2 (N = 200)Omission (no stimulus) (N = 150)Repetition (stimulus 2) (N = 50)
Stimulus 3 (N = 200)Alternation (stimulus 2) (N = 150)Alternation (stimulus 1) (N = 50)
  • The pitch of the first tone could be one of three stimuli with equal probability. The second tone followed the first tone with a probability of 0.75 (expected trials) or 0.25 (unexpected trials), and was of the same pitch (repetition trials), of a different pitch (alternation trials), or omitted (omission trials).