July 18, 2017 14:00 〜 15:00
CiNet 1F Conference Room
Masamichi J. Hayashi
Graduate School of Frontier Biosciences
Department of Psychology
University of California, Berkeley
Host : Masahiko Haruno (PI)
Time and space are fundamental dimensions of our perception and action.
While the neural basis of spatial perception has been studied extensively, our current understanding of the neural basis of time perception is still limited. In this talk, I will show some evidence that duration information is represented by a population code, and this neural representation is associated with our experience of time. First, using neuroimaging techniques we show that repetition of an identical stimulus duration produces a reduction of the blood-oxygenation-level dependent signal in the right inferior parietal lobule (rIPL). This suggests that the rIPL has a population of neurons tuned for specific durations. A follow-up study further supported this idea by showing that duration information is decodable from multivariate activity patterns in the rIPL. Finally, we show that the rIPL activity reflects our experience of time rather than simply physical durations of stimuli.
Together, our studies suggest that subjective experience of time is mediated by duration-tuned neural populations in the rIPL.