November 2002
Volume 2, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   November 2002
Perceived higher luminance in the glare effect does not give rise to a stronger afterimage
Author Affiliations
  • Hongjing Lu
    UCLA, USA
  • Daniele Zavagno
    NEC Research Institute, USA
  • Zili Liu
    UCLA, USA
Journal of Vision November 2002, Vol.2, 364. doi:10.1167/2.7.364
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      Hongjing Lu, Daniele Zavagno, Zili Liu; Perceived higher luminance in the glare effect does not give rise to a stronger afterimage. Journal of Vision 2002;2(7):364. doi: 10.1167/2.7.364.

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Abstract

Purpose: The glare effect refers to the phenomenon that when a surface is surrounded by regions of outwardly decreasing luminance, it will be perceived as self-luminous (Zavagno, 1999). It is also perceived to be of higher luminance. We investigated whether such a stimulus also gives rise to a longer lasting afterimage, as a stimulus of higher luminance would.

Method: Two glare-effect stimuli and two controls were used. The first glare-effect stimulus was a cross figure — a white square surrounded by four squares, the luminance of each of the four decreases outwardly. The second stimulus was a white disk surrounded by an annulus of decreasing luminance in the radial direction. For the control stimuli, the direction of the luminance gradient was reversed. In each trial, a stimulus was presented against a gray background for either 8, 12, or 16 seconds. It was then replaced by an outline figure, which was either a square or a circle slightly smaller than the white square or disk of the stimulus just presented. When the dark afterimage disappeared within this outline figure, the subject pressed a button to record the lifetime.

Result: As expected, the longer the stimulus presentation, the longer its afterimage lasted (F(2,6)=11.22, p<0.01). However, the glare-effect stimuli did not give rise to longer lasting afterimages. In fact, the lifetime was slightly shorter (F(1,3)=10.91,p<0.05).

Conclusion: The glare effect, although perceived to be of higher luminance, does not register a longer lasting afterimage. This indicates that the percept involves higher mechanisms than those responsible for afterimages.

Lu, H., Zavagno, D., Liu, Z.(2002). Perceived higher luminance in the glare effect does not give rise to a stronger afterimage [Abstract]. Journal of Vision, 2( 7): 364, 364a, http://journalofvision.org/2/7/364/, doi:10.1167/2.7.364. [CrossRef]
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