Pitch motion with random chord sequences

J. Allik, E.N. Dzhafarov, A.J.M. Houtsma, J. Ross, N.J. Versfeld

    Research output: Contribution to journalArticleAcademicpeer-review

    14 Citations (Scopus)


    Perception of global pitch motion was studied through psychoacoustic experiments with random chord sequences. Chords contained either six or eight (fixed) tone elements, being sinusoidal, sawtooth-like, or Shepard tones, which were either on or off according to a probability controlled by the experimenter. Sequences of 2, 4, 5, or 8 chords were used. Identification by subjects of the perceived direction of overall pitch motion (up or down) was found to be well accounted for by a model in which the ultimate pitch motion percept is given by a sum of contributions from selected element transitions-that is, transitions between adjoining tone elements in successive time frames only. In its simplest form, this dipole contribution model has only one free parameter, the perceptual noise for an element transition, which was estimated for various acoustic tone representations and chord arrangements. Results of two experiments, which were carried out independently in two different laboratories, are reported.

    Original languageEnglish
    Pages (from-to)513-527
    Number of pages15
    JournalPerception & Psychophysics
    Issue number6
    Publication statusPublished - Nov 1989


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