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Schedule in October 2013


The 22nd Virtual Reality Psychology International Conference

Date: Saturday, 12 October 2013
Place: Room 511, Ohashi Campus, Kyushu University
Cosponsored by Technical Committee of Virtual Reality Psychology, the Virtual Reality Society of Japan, and Research Center for Applied Perceptual Science, Kyushu University
Language: English 

Program

0. Opening remarks (13:00-13:10)
Yoshitaka Nakajima (Kyushu University)

Session 1 (13:10-14:25)

1. Stimulus meaning alters vection strength
Takeharu Seno (Kyushu University)

2. Two successive dots in downward direction increase perceived duration
Tsuyoshi Kuroda (Research Fellow of JSPS / Kyushu University), Simon Grondin (Laval University), Katsuya Ogata, Shozo Tobimatsu (Kyushu University)

3. ERP investigation on intra- vs. inter-modal duration discrimination
Emi Hasuo (Kyushu University), Emilie Gontier (Universite Laval), Takako Mitsudo (Kyushu University), Simon Grondin (Universite Laval)

4. The contribution of the vibrotactile stimulation to our self-body position perception: The mirror illusion study
Daisuke Tajima (Tokyo Institute of Technology), Tota Mizuno (The University of Electro-Communications), Yuichiro Kume (Tokyo Polytechnic University), Takako Yoshida (Tokyo Institute of Technology)

5. The critical visual feedback delay to turn our self-body sensations into others: The hand and eye movement study
Seiya Kamiya, Takako Yoshida (Tokyo Institute of Technology)

Coffee Break (14:25-14:35)

Session 2 (14:35-15:35)

6. Distortion of auditory space during visually induced self-motion perception
Wataru Teramoto, Kazuki Moishi (Muroran Institute of Technology), Zhenglie Cui, Shuichi Sakamoto, Jiro Gyoba (Tohoku University)

7. Temporal periodicity with Japanese- and English-learning infants
Yuko Yamashita, Yoshitaka Nakajima, Kazuo Ueda, Takeharu Seno (Kyushu University), Yohko M. Shimada (Doshisha University), David Hirsh (University of Sydney)

8. Perceptual roles of power-fluctuation factors of speech sound revealed by cepstral liftering and zero-shifted factor analysis
Takuya Kishida, Yoshitaka Nakajima, Kazuo Ueda, Gerard B. Remijn, Takuya Fujioka (Kyushu University)

9. Forecasting and analysis of social psychology using WOM: Case of art management
Yasuko Kawahata, Etsuo Genda (Kyushu University)

Coffee Break (15:35-16:00)

Mini International Symposium on Vection (16:00-18:00)

10. Opening remarks and an introduction to vection
Takeharu Seno (Kyushu University)

(Two vection studies by younger generations)

11. Self-motion perception by wind
Kayoko Murata, Masami Ishihara, and Shigeru Ichihara (Tokyo Metropolitan University)
We examined whether a feeling of self-motion would occur when feeling wind on the skin accompanied by vestibular motion. Participants perceived the strongest self-motion in the vestibular motion and wind condition. Wind from the front induced stronger self-motion than other directions. We divided the face into upwards and downwards from the center of the maxillary division. We compared the upper part with the lower. When the upper part of the face was masked, all indexes indicated a decrease in self-motion. Therefore, this result suggests that the upper part and lower part of the face might use different information processing systems.

12. Examining the cause of inverted vection using expanding/contracting random-dot patterns
Yasuhiko Saito and Kenzo Sakurai (Tohoku Gakuin University)
The "inverted vection" is self-motion perception in the same direction as a foreground motion induced by the slowly translating foreground with an orthogonally moving background (Nakamura & Shimojo, 2000). We extended their study to (1) investigate whether the inverted vection in depth occurs or not, and to (2) reexamine their claim that the mis-registration of eye movement by suppression of optokinetic nystagmus (OKN) induced by the foreground pattern causes the inverted vection (Nakamura & Shimojo, 2003). For these purposes, a non-translational expanding/contracting visual stimulus pattern as a foreground was used to prevent the translational OKN in Experiment 1 and 2. And also another non-translational rotating visual pattern was used as a background to eliminate the all possible translational OKN in Experiment 2. In Experiment 1, observers wore a shutter goggle for stereoscopic vision, and viewed stimuli on a screen in 120 cm viewing distance. A fixation cross was always presented in the center of screen surface. The background pattern was perceived to be 15 cm farther than the screen with rightward translating random-dot sat a constant speed of 25 deg/s. The foreground pattern was perceived to be 15 cm nearer than the screen with expanding/contracting random-dots at 5 constant accelerations (0.056, 0.223, 0.893, 3.571, 14.286 deg/sec2). Both foreground and background patterns were presented in the experimental condition. Only the foreground pattern was presented in the control condition. Observers performed key-press to report their perceived forward/backward self-motion, and the reported direction and duration of self-motion were recorded. In experimental condition, observers reported inverted vection when the foreground random-dots expanded/contracted slowly, and they reported ordinary vection when the random-dots expanded/contracted fast. In control condition, the duration of the self-motion sensation varied linearly with the speed of stimulus motion. The faster motion induced the stronger self-motion sensation in the direction opposite to the pattern motion. In Experiment 2, methods were the same as in Experiment 1 except that a rotating clockwise/counter-clockwise random-dot pattern was used as the background at a constant angular velocity (25 deg/s). Observers perceived the inverted vection when the foreground pattern expanded/contracted slowly in experimental condition while they reported the ordinary vection in control condition as same as the results of Experiment 1. We conclude that (1) the inverted vection in depth occurs, and (2) there must be some factor for the inverted vection in depth other than the mis-registration of eye movement by suppression of translation OKN.

(Invited Talks)

13. Using Virtual Reality to study multi-modal and higher-level contributions to selfmotion illusions ("vection")
Bernhard Riecke (Simon Fraser University Surrey)
There is a long tradition of investigating self-motion illusions induced by rotating or translating visual stimuli ("circular/linear vection"). Other modalities can also induce vection or contribute to visually induced vection, but have received considerably less attention in the literature. Here, I will focus specifically on non-visual and multi-modal contributions and interactions to vection. A part from vection being arguably one of the most compelling and embodied illusions, vection is also interesting from a fundamental research perspective, in particular in the context of investigating cue integration: In a vection-inducing situation, there is always a (more or less noticeably) cue conflict between some cues indicating self-motion (e.g., a moving visual or auditory stimulus) while others indicate stationarity or a lack of acceleration (e.g., tactile, kinesthetic, and vestibular cues from sitting on a stationary chair). From a more applied perspective, we are investigating how self-motion illusions could be utilized to improve self-motion simulations and human performance in virtual environments, in an attempt to reduce the need for costly physical motion of the observer. 

14. Inducing visual illusions of self-motion: Stimulus determinants and observer contributions
Stephen Palmisano (University of Wollongong)
Vection is a term typically used to refer to visually induced illusions of self-motion. Over the years my colleagues and I have shown that many previously overlooked visual consequences of self-motion – stereoscopic motion, local changes in optical size, viewpoint jitter/oscillation and eye-movements – all play important roles in vection. These findings disprove long held assumptions that: (i) visual self-motion perception is based solely on the optic flow presented to a single eye; (ii) dot motion displays convey all of the important visual information for self-motion; and (iii) visually simulated self-acceleration prevents/destroys vection. Recently, we have also examined how vection is altered by eye-movements. For example, we have shown that superimposing a laterally moving fixation point onto a radial optic flow display can dramatically enhance the experience of vection in depth. Such findings suggest that common pursuit eye-movement errors play important roles in vection induction. In fact, in some situations, eye-movement patterns might even serve as objective indicators of vection.

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