November 2002
Volume 2, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   November 2002
Perception of motion with orientation-defined missing fundamental gratings
Author Affiliations
  • Masamitsu Harasawa
    The Univ of Tokyo, Japan
Journal of Vision November 2002, Vol.2, 640. doi:10.1167/2.7.640
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      Masamitsu Harasawa, Kazushi Maruya, Takao Sato; Perception of motion with orientation-defined missing fundamental gratings. Journal of Vision 2002;2(7):640. doi: 10.1167/2.7.640.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: It has been known that for luminance-defined missing fundamental (MF) with 1/4 cycle shifts is perceived in the direction opposite to physical shift. Similar phenomenon was reported for disparity- (Smith & Scott-Sammuel, 1998) and motion-defined (Maruya & Sato, 2001) MF patterns. In these stimuli, modulated features were derived from magno-pathway. In our study, we examined orientation-modulated MF patterns whose feature was derived from parvo-pathway and investigated higher-order motion perception based on first-order-like detectors. Our stimuli were made of orientation filtered random noise where no first-order artifact existed since source noise was replaced dynamically.

Method: The stimuli were 3.2 (V) × 9.7 (H) deg orientation-defined 0.15 cpd MF patterns generated by filtering random noise with Gabor filters (f=2.6cpd, sigma=0.21deg). Orientation of the Gabor filter was varied along horizontal axis following MF waveform between 0 to 90 deg. Stimuli were consisted of 5 motion frames. MF patterns were shifted 1/4 cycle between frames. Each frame was consisted of 8 temporal subframes (20ms) they were generated from different random noise with the identical orientation-modulation filter. ISI between motion frames was varied from 0 to 320ms. Subjects were asked to report the motion direction by 2AFC.

Results: Motion in the direction of shift was perceived for sinusoidal orientation-defined-motion patterns. For MF patterns, however, motion in the direction opposite to shift was dominant.

Conclusions: These results suggest that visual system detects higher-order motion in a similar way to that of regular first-order motion detectors in orientation-defined motion patterns. The present results suggested that higher-order motion system based on Fourier component like first-order detector is independent on modulated feature, even when original signal is derived from parvo-pathway.

Harasawa, M., Maruya, K., Sato, T.(2002). Perception of motion with orientation-defined missing fundamental gratings [Abstract]. Journal of Vision, 2( 7): 640, 640a, http://journalofvision.org/2/7/640/, doi:10.1167/2.7.640. [CrossRef]
Footnotes
 Supported by HFSP and JSPS.
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