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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 18, Iss. 9 — Sep. 1, 2001
  • pp: 2255–2266

Inefficient visual search for second-order motion

Hiroshi Ashida, Adriane E. Seiffert, and Naoyuki Osaka  »View Author Affiliations


JOSA A, Vol. 18, Issue 9, pp. 2255-2266 (2001)
http://dx.doi.org/10.1364/JOSAA.18.002255


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Abstract

Visual search rate was used to assess attentional resources required for detection of opposing motions defined either by luminance or by modulations of texture contrast, flicker, or size. Though luminance-based targets were detected quickly, search through second-order motion was slow. Control experiments ruled out stimuli visibility, complexity, eccentricity sensitivity, and attributes of the carrier as possible accounts. Results suggest separate processing of the two types of stimuli: Luminance-based motion is detected by spatiotemporal filters, whereas second-order motion is likely processed by a capacity-limited, later stage. Rate-reducing effects of increased contrast and speed mirrored previous research suggesting that effortful feature tracking may be the mechanism.

© 2001 Optical Society of America

OCIS Codes
(330.4150) Vision, color, and visual optics : Motion detection
(330.5510) Vision, color, and visual optics : Psychophysics

History
Original Manuscript: November 28, 2000
Revised Manuscript: March 2, 2001
Manuscript Accepted: March 2, 2001
Published: September 1, 2001

Citation
Hiroshi Ashida, Adriane E. Seiffert, and Naoyuki Osaka, "Inefficient visual search for second-order motion," J. Opt. Soc. Am. A 18, 2255-2266 (2001)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-18-9-2255

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