Schedule in June 2014
Special Lecture about Non-negative Matrix Factorization
Sponsored by Research Center for Applied Perceptual Science, Kyushu University
Date and time: 24 June 2014, 13:00-14:30 and 16:40-18:10
The 14th Perceptual Frontier Seminar: Time Perception, Brain Activity, and Bayesian Modeling
Date and time: Monday, 23 June 2014, 18:30-20:00
1. When we decide time: evidence on brain mechanism of the auditory temporal assimilation by EEG
We delineate the characteristics of human auditory temporal processing related to auditory temporal assimilation, by conducting electroencephalographic (EEG) measurement. Thirteen participants only listened to two neighboring time intervals (T1 and T2), marked by three successive tone bursts, in the first session, and judged the equality/inequality of the same stimulus patterns in the next session. Brain activity related to the perceptual equality/inequality of neighboring time intervals appears clearly, and "equal" judgments and "unequal" judgments correspond to different ERP patterns, even when the stimulus pattern is the same.
2. Bayesian inference explains perceptual underestimation and overestimation of second interval in two neighboring time intervals
The purpose of this study is to examine theoretically what are neural computational components for the perception of two neighboring time intervals. We modeled the temporal perception by Bayesian inference, assuming that our brain judges the source identity of the three sounds. Our model can qualitatively replicate the characteristics of the temporal perception such as the underestimation and overestimation of the second time interval which occurs under different conditions.
We will get together at Kazuo UEDA's office, 709, 7th floor of the Build. 3, after the Seminar will be over.