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Schedule in July 2013


The 7th Perceptual Frontier Seminar

Date and time: 26 July 2013, 17:00-19:00
Venue: Ohashi Satellite, Ohashi Campus, Kyushu University (at the southwest cornar of the east-side intersection of Nishitetsu Ohashi Station)
Language: English
Organizer: Takeharu SENO (Institute for Advanced Study/ReCAPS, Kyushu University) 

Talk 1: Computation and cognitive processing of subjective color illusion
Haruaki FUKUDA*
*Department of General System Studies, the University of Tokyo

Color perception can arise subjectively even from the objectively achromatic stimuli, and this effect have been called subjective color illusion. We can consider these colors as the results from purely our neural and cognitive processing. In this presentation, we will discuss the cognitive mechanisms of color perception with some experimental results about subjective color.

Talk 2: Cross-cultural differences in unconscious knowledge
Sachiko KIYOKAWA*
*Graduate School of Education and Human Development, Nagoya University

Previous studies have indicated cross-cultural differences in conscious processes, such that Asians have a global preference and Westerners a more analytical one. We investigated whether these biases also apply to unconscious knowledge. In my talk, I will report four experiments examining how cultural biases affect the type of unconscious knowledge people acquire.

Talk 3: A reinterpretation of the reanalysis of electroencephalograms associated with time perception using Bhattacharyya distance
Hiroshige TAKEICHI*, Yoshitaka NAKAJIMA**, Takako MITSUDO**, and Shozo TOBIMATSU**
*RIKEN, **Kyushu University

Previously, we reanalyzed Mitsudo et al.'s (2012) electroencephalogram (EEG) data to extract brain activity associated with time perception. EEGs obtained when participants made temporal judgments for simple stimuli were compared with EEGs obtained when the participants passively listened to the stimuli using Bhattacharyya distance. As a result, the difference started to increase at the beginning of the stimulus. Here, in order to confirm the validity of the observation above, we made a "mosaic" data set by swapping a half of the data between the two conditions and calculated Bhattacharyya distance in the same manner, expecting that a different pattern of results was to be obtained. Quite surprisingly, the same pattern of the results was obtained. Thus our previous results failed to "pass the mosaic test", requiring a reinterpretation of the results. The rise of the Bhattacharyya distance seems to reflect increase in the individual difference in response to the stimulus as well as increase due to the conditional difference.

We will get together for dinner after the seminar. We would be most grateful if you could make a contact with Dr. SENO (seno[at]design.kyushu-u.ac.jp) beforehand, in case of joining the dinner.

Photos

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