Direction without speed information process in the human brain: a magnetoencephalographic study using random dots apparent motion stimulus

Abstract

Apparent motion stimulus induces visual perception of smooth motion even though there is no speed information. We examined whether human brain response as measured by magnetoencephalography carries direction information in the visually presented apparent motion of a random-dot pattern in a similar manner as continuous motions that have speed and direction information. Although there was no significant effect of motion direction on the peak response latency and amplitude, mutual information entropy (IE) significantly increased after the motion onset at approximately 36 ms after the response latency in 41% of the evaluations. Detailed analysis of the data from five subjects who participated in both the present apparent motion and our previous coherent motion studies revealed that the maximum IE latency (delay) for apparent motion was significantly longer than that for coherent motion, although the mean maximum IE was the same. The results indicate that direction is represented in the response waveform evoked by apparent motion but the manner is different from that for coherent motion probably due to the distinct neural processes engaged only for the apparent motion perception. We consider that direction and speed can be processed separately in the human brain because direction information was generated without speed information for the perception of apparent motion.

Cognitive Decision-making and Public Opinions

“…Economic development and the growth of national strength have always been the highest goal of human society, and economic prosperity is often at the expense of the environment and human resources for survival (Oka et al, 2011). China's rapid development has greatly improved its people's life, but the present situation of environment is disturbing and production safety accidents often occur (Deco and Kringelbach, 2017).…”