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2019 年 5 月

The 47th Perceptual Frontier Seminar: An Evening of Psychophysics on Visual Perception

Date and time: Friday, 10 May 2019, 17:00-19:10
Venue: Workshop Room on the 1st Floor of Building 7, Ohashi Campus, Kyushu University, Fukuoka, Japan <http://www.design.kyushu-u.ac.jp/kyushu-u/english/access>
Language: English
Organizer: Takeharu SENO (Kyushu Univ./ReCAPS)

Program

17:00-17:45 How do we correctly perceive approaching moving object?
Shigehito TANAHASHI*
*Institute of Science and Technology, Academic Assembly, Niigata University

Binocular parallax and vergence eye movements produced by fixating a target are known to be able to serve as cues to distance in the three-dimensional space. Some recently previous studies by neuroscience suggested that the integration process of the depth perception was different for each individual. On the other hands, we did not know the detail of the motion-in-depth mechanisms. For example, Erkelens and Collejin (1985) suggested that motion-in-depth cannot be necessarily perceived by changes in binocular parallax, and rather can be dominated by changes in relative binocular disparity between objects. However, interactions between motion motion-in-depth cues has not been well examined. In this seminar, I would like to explore the integration process of the visual cues on motion-in-depth through the visual psychophysical and neuroscience experiment.

17:45-18:30 Visual motion processes underlying classical apparent motion and object tracking
Hidetoshi KANAYA* and Takao SATO*
*College of Comprehensive Psychology, Ritsumeikan University

Human beings perceive the motion of objects, e.g., human, car, and ball, in our daily life. In the present study, underlying visual motion processes were examined when observers perceive apparent motion for isolated objects and when they track moving object(s) by using methods and stimuli such as inter-stimulus interval (ISI), dichoptic stimulation, and first-/second-order motion. First, the spatiotemporal characteristics of classical apparent motions were examined by using these methods and stimuli. Second, tracking scores in object tracking task were also measured. From these results, motion processes for isolated objects underlying classical apparent motion and object tracking will be discussed.

18:30-19:10 The detection mechanism for curved and straight lines
Marie MORITA*
*Department of Psychology, Graduate School of Letters, Ritsumeikan University

Human visual system has great sensitivity for detecting curved line (discrimination between straight and curved line). In this study, we showed that curvature detection mechanism is mediated by three different systems, orientation detector, visual acuity and spatial displacement detector (Vernier acuity), by using adaptation method. Following these experiments, we suggested the possibility that visual system have alternative algorithm for detecting straight line itself.

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