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Journal Article

Citation

Sperling G, Dosher BA, Landy MS. J. Exp. Psychol. Hum. Percept. Perform. 1990; 16(2): 445-450.

Affiliation

Psychology Department, New York University, New York 10003.

Comment On:

J Exp Psychol Hum Percept Perform 1990;16(1):211-6

Copyright

(Copyright © 1990, American Psychological Association)

DOI

unavailable

PMID

2142211

Abstract

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.


Language: en

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