August 2010
Volume 10, Issue 7
Free
Meeting Abstract  |   August 2010
Changes in Bistable Perception Induced by Fear Conditioning
Author Affiliations
  • Ji-Eun Kim
    Department of Psychology, Korea University
  • Tae-Ho Lee
    Deptartment of Psychology, Korea Military Academy
  • Hanmo Kang
    Department of Psychology, Korea University
  • Chai-Youn Kim
    Department of Psychology, Korea University
Journal of Vision August 2010, Vol.10, 337. doi:10.1167/10.7.337
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      Ji-Eun Kim, Tae-Ho Lee, Hanmo Kang, Chai-Youn Kim; Changes in Bistable Perception Induced by Fear Conditioning. Journal of Vision 2010;10(7):337. doi: 10.1167/10.7.337.

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Background: When observers view ambiguous figures for prolonged period of time, they experience perceptual alternations between two possible visual interpretations (Leopold & Logothetis, 2003). Dubbed bistable perception, this phenomenon has been considered as a useful means to study visual awareness since it induces spontaneous fluctuation in awareness despite constant physical stimulation (Kim & Blake, 2005). To investigate whether visual awareness during bistable perception is affected by emotional valence associated with one of two interpretations, we exploited Pavlovian fear conditioning (Pavlov, 1927). Methods: Among a variety of ambiguous figures, we selected man-rat and duck-rabbit which induced balanced perceptual alternations in a pilot test. Prior to and following conditioning, observers tracked their perceptual experiences during 12 100-sec trials (6 for each ambiguous figure) by depressing one of two keyboard buttons. During conditioning, a pair of unambiguous variants of the man-rat figure was used as conditioned stimuli (CS). For a half of the observers tested, the man image (CS+) was paired partially with electrical finger shock (US) while the rat image (CS-) was unpaired with the electrical shock. For the other half, the rat image was CS+ while the man image was CS-. Reaction time was measured following observers' 2-AFC discrimination task (man or rat) to assess conditioning effect independently. Anxiety test was also given to all observers. Results: For observers who showed faster response to CS+ paired with the shock than to CS- during conditioning, perceptual awareness of CS+ during bistable perception increased following conditioning. Besides, observers who marked high anxiety scores tend to perceive CS- longer following conditioning. Conclusion: Perceptual awareness during bistable perception is affected by fear conditioning. Individual differences in susceptibility of conditioning and the level of anxiety are influential factors.

Kim, J.-E. Lee, T.-H. Kang, H. Kim, C.-Y. (2010). Changes in Bistable Perception Induced by Fear Conditioning [Abstract]. Journal of Vision, 10(7):337, 337a, http://www.journalofvision.org/content/10/7/337, doi:10.1167/10.7.337. [CrossRef]
 
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