Korean Journal of Cognitive Science (인지과학)

The Korean Society for Cognitive Science (한국인지과학회)
권호 표지

3D motion aftereffect in a static region after adaptation to an adjacent counterphase flickering region

역 위상 깜박임 영역 순응에 의해 유도된 인접 영역의 3차원 운동잔여 효과

  • Published : 1999.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

Murakami and Cavanagh (1998a,b, 1999) reported a jitter aftereffect in a static random noise after a period of adaptation to a patch of dynamic random noise. To a account for this phenomenon. they proposed the retinal slip caused by a small eye movements in the unadapted area, which is usually compensated by the visual system to stabilize images but is unsuppressed due to the adaptation. We tested this hypothesis with new experimental method and stimuli that were supposed to nullify or reduce the effect. However. the aftereffect was still observed even under these stimuls conditions More importantly, the perceived aftereffect was rather different from Murakami and Cavanagh's. After adaptation to a counterphase flickering cosine grating, the adjacent unadapted region seems to move away from the observer during the test period instead of jittering in the frontoparallel plane. We proposed a possible explanation for this new phenomenon noting the severe contrast reduction of the adapted region during flickering period. The aftereffect might be due to the flicker-inducing contrast reduction during adaptation that produces different depth planes for the adapted and unadapted region and its restoration during the test period.

Murakami와 Cavanagh (1998a.b. 1999)가 보고한 무선 운동 영역 순응에 따른 정지된 인접 영역의 흔들림(jittering) 착시현상을 새로운 자극구성으로 검증하였다. 이 현상에 대한 설명으로 이 연구자들이 제안한 순응에 따른 안구운동 보상기제의 약화를 최소화하는 역 위상 깜박임(counterphase flickering)에의 순응과 코사인 패턴을 사용하였을 때에도 정지된 인접 영역에서의 착시현상이 경험되었다. 그러나, 이 자극 상황에서 관찰된 착시현상은 평면상의 흔들림이 아니라 정지된 인접 영역이 관찰자에서 멀어지는 것으로 지각되는 3차원상의 운동잔여효과(3D motion aftereffect)이었다. 본 연구에서 우리는 이 새로운 현상이 깜박임 영역의 휘도 대비감소(contrast reduction)가 정지된 인접 영역과의 지각된 깊이 차이를 유발시키고 깜박임 영역이 정지하였을 때 원래의 깊이로 복원하는 과정에서 정지된 인접 영역이 상대적으로 멀어지며 움직이는 것으로 지각되는 것에 기인했을 가능성을 조사하였다. 깊이 단서를 제거하거나, 휘도 대비감소를 최소화하는 고 공간주파수 코사인 패턴을 사용한 실험의 결과 관찰된 운동잔여효과의 소멸은 이 가능성을 강력히 지지하여 주었다.

Keywords

References

  1. Investigative Ophthalmology and Visual Science v.40 Adaptation to uniform flicker elevates motion coherence thresholds Boden, C.;Giaschi, D.
  2. Proceedings of the National Academy of sciences of the U.S.A. v.86 Two motion perception mechanisms revealed through distance-driven reversal of apparent motion Chubb, C.;Sperling, G.
  3. Vision Research v.22 Spatial frequency selectivity of cells in macaque visual cortex De Valois, R. L.;Albrecht, D. G.;Thorell, L. G.
  4. Perception: The world transformed Kaufman, L.
  5. Vision Research v.34 Direction repulsion between components in motion transparency Kim, J.;Wilson, H. R.
  6. Nature v.361 Visible flicker from invisible patterns MacLeod, D. I. A.;He, S.
  7. Nature v.395 A jitter after-effect reveals motion-based stabilization of vision Murakami, I.;Cavanagh, P.
  8. Investigative Ophthalmology and Visual Science v.39 a novel aftereffect: visual jitter in an unadapted static region after adaptation to dynamic random noise Murakami, I.;Cavanagh, P.
  9. Investigative Ophthalmology and Visual Science v.40 A directionally selective monocular adaptation process and a distinctive bilateral compensation process for visual jitter Murakami, I.;Cavanagh, P.
  10. Investigative Ophthalmology and Visual Science v.34 Two kinds of motion aftereffect reveal different types of motion processing Nishida, S.;Sato, T.
  11. Vision Research v.34 Complete interocular transfer of motion aftereffect with flickering test Nishida, S.;Ashida, H.;Sato, T.
  12. Journal of the Optical Society of America, A v.9 Immobility of some second-order stimuli in human peripheral vision Pantle, A.
  13. Investigative Ophthalmology and Visual Science v.27 Direct comparisons of apparent motions produced with luminance, contrast-modulated (CM), and texture gratings Pantle, A.;Turano, K.
  14. Perception v.20 Evidence for a common motion mechanism of luminance and contrast modulated patterns: selective adaptation Turano, K.
  15. Journal of the Optical Society of America v.1 Modified line-element theory for spatial-frequency and width discrimination Wilson, H. R.;Gelb, D.
  16. Visual Neuroscience v.11 A model for motion coherence and transparency Wilson, H. R.;Kim, J.
  17. Science v.255 Information processing in the primate visual system: an integrated systems perspective van Essen, D. C.;Anderson, C. H.;Felleman, D. J.
  18. Journal of Applied Mechanics v.18 A statistical distribution function of wide applicability Weibull, W.
  19. Eye movements and Vision Yarbus, A. L.