How to Study the Kinetic Depth Effect Experimentally

George Sperling, Barbara A. Dosher, Michael S. Landy

Research output: Contribution to journalArticlepeer-review


Sperling, Landy, Dosher, and Perkins (1989) proposed an objective 3D shape identification task with 2D artifactual cues removed and with full feedback (FB) to the subjects to measure KDE and to circumvent algorithmically equivalent KDE-alternative computations and artifactual non-KDE processing. (1) The 2D velocity flow-field was necessary and sufficient for true KDE. (2) Only the first-order (Fourier-based) perceptual motion system could solve our task because the second-order (rectifying) system could not simultaneously process more than two locations. (3) To ensure first-order motion processing, KDE tasks must require simultaneous processing at more than two locations. (4) Practice with FB is essential to measure ultimate capacity (aptitude) and, thereby, to enable comparisons with ideal observers. Experiments without FB measure ecological achievement-the ability of subjects to extrapolate their past experience to the current stimuli.

Original languageEnglish (US)
Pages (from-to)445-450
Number of pages6
JournalJournal of Experimental Psychology: Human Perception and Performance
Issue number2
StatePublished - May 1990

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Arts and Humanities (miscellaneous)
  • Behavioral Neuroscience


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