Space, Time and Motion
Jul. 15, 2017 13:30 PM - 15:30 PM
Talk session 4, 2nd Lecture Room |
Stimulus structure impacts population codes for motion within and between visual areas V1 and MT
Presentation Number:T22.21 Time:13:30 - 13:45 Abstract Number:0008 |
Elizabeth Zavitz 1, *, Maureen A. Hagan 1, Marcello G.P. Rosa 1, Hsin-Hao Yu 1, Leo L. Lui 1, Nicholas S.C. Price 11Monash University
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The spinner illusion and the effect of harmonic components
Presentation Number:T22.22 Time:13:45 - 14:00 Abstract Number:0056 |
Hiroshi Ashida 1, *, Alan Ho 2, Akiyoshi Kitaoka 3, Stuart Anstis 41Kyoto University 2Ambrose University 3Ritsumeikan University 4University of California, San Diego
The spinner illusion is an academic form of ‘The Coyote Illusion’ (Ho & Anstis, 2013 Best Illusion of the Year contest), demonstrating that moving stimuli appear faster with higher spatial frequencies when the physical speed is constant (Ashida, Ho, Kitaoka, and Anstis, 2017, i-Perception). One problem is that the illusion persists up to 16 elements per revolution with the original ring of spots while the effect almost saturates at around 8 cycles per revolution (c/rev) with sinusoidal gratings. The reason for this discrepancy could be that the spot stimulus has sharp edges that introduce harmonic components of higher spatial and temporal frequencies. We therefore measured the spinner illusion in radial gratings of 8 c/rev vs 16 c/rev, with either sine-wave (no harmonics) or square-wave (having odd spatial harmonics) modulation of luminance. We found that the square-wave stimuli yielded a larger effect of speed overestimation for 16 c/rev than the sine-wave stimuli. This difference could be mainly attributed to the observation that 8-c/rev square-wave stimulus was perceived slower than the 8-c/rec sine-wave stimulus. These results, which are qualitatively consistent with Brooks, Morris, and Thompson (2011, J. Vis.), demonstrate a crucial role of harmonic components in speed perception.
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Illusory motion at the photoreceptor level: insights from a computational model of visual transduction dynamics.
Presentation Number:T22.23 Time:14:00 - 14:15 Abstract Number:0092 |
Gert van Tonder 1, Hiroshi Ashida 2, *1Indenpendent Researcher 2Kyoto University
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Impaired Sensitivity in Recognizing Biological Motions and Goal-Intentions in Patients with Parkinson’s Disease & Dementia
Presentation Number:T22.24 Time:14:15 - 14:30 Abstract Number:0032 |
Mary Wen-Reng Ho 1, Shu-Fei Yang 2, Chun-Man Chen 1, Chon-Haw Tsai 3, Hsien-Yuan Lane 4, Sarina Hui-Lin Chien 5, *1Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan 2Graduate Institute of Neural & Cognitive Sciences, China Medical University, Taichung, Taiwan 3Department of Neurology, China Medical University Hospital, Taichung, Taiwan 4Graduate Institute of Biomedical Science, and Graduate Institute of Clinical Medical Science of China Medical University, Taichung, Taiwan 5Graduate Institute of Biomedical Sciences, and Graduate Institute of Neural & Cognitive Sciences China Medical University, Taichung, Taiwan
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Serial dependence in interval timing
Presentation Number:T22.25 Time:14:30 - 14:45 Abstract Number:0130 |
Huihui Zhang 1, David Alais 1, *, Xiaolin Zhou 21School of Psychology, The University of Sydney 2School of Psychological and Cognitive Sciences, Peking University
Visual perception is serially dependent, influenced by immediate past experience. Here, we examined whether time perception was susceptible to the recent history of temporal information. Participants were required to reproduce time intervals (810 - 1200 ms) in either a unisensory or a multisensory context. In unisensory tasks, sample intervals were presented in a single visual or auditory modality; in multisensory tasks, half the intervals (those of shorter length) and the other half (intervals of longer length) were presented in different modalities, visual and auditory. We found that reproduced times were biased towards the mean of the distribution of time intervals in both unisensory and multisensory tasks, suggesting that participants’ timing was influenced by the prior distribution of time intervals. In addition to this classic central tendency effect, we also found positive serial dependencies in both unisensory and multisensory tasks. However, for the multisensory tasks, further analysis showed that the positive serial dependencies only appeared if the previous trial and the current trial came from the same modality. Our findings suggest that two types of past experience influence current timing: a long-term prior which is represented in a supramodal manner, and a short-term serial dependence bias which is exclusively unimodal.
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Time stays still under blue light: subjective time expansion with increased stimulation level of intrinsically photosensitive retinal ganglion cells
Presentation Number:T22.26 Time:14:45 - 15:00 Abstract Number:0058 |
Pei-Ling Yang 1, Sei-ichi Tsujimura 2, Akiko Matsumoto 2, Wakayo Yamashita 2, Su-Ling Yeh 1, *1Department of Psychology, National Taiwan University, Taiwan 2Faculty of Science and Engineering, Kagoshima University, Japan
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Modeling the learning process of object locations in natural scenes
Presentation Number:T22.27 Time:15:00 - 15:15 Abstract Number:0060 |
Satoshi Shioiri 1, *, Zhengxiong Yuan 1, Kazumichi Matsumiya 1, Ichiro Kuriki 11Tohoku University
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