Analysis of EEG Relating to Subjective Preference for Horizontal Visual Motion
Yosuke Okamoto, Yoshiharu Soeta, and Yoichi Ando
This study aimed to identify the relationship between human brain response and subjective preference for horizontal visual motion of a sinusoidal movement over varying periods. Electroencephalograms (EEGs) were recorded during the presentation of the most or less preferred moving stimuli. Brain waves were analyzed using both the autocorrelation function (ACF) and cross-correlation function (CCF). The effective duration (te) was analyzed from the initial range of the delay of ACF of the brain waves. The results showed that the value of te of alpha waves for stimulus in the most preferred condition was longer than that for stimulus in the less preferred conditions. In addition, the maximum value of the CCF (|f(t)|max) between brain waves recorded at different electrode sites was analyzed. The results showed that the value of |f(t)|max of alpha waves for stimulus in the most preferred was greater than that for the stimulus in the less preferred conditions. These results indicate that the brain repeats the rhythm in the alpha range in the time domain, and that this activity spreads wider over the human brain cortex as a result of the presentation of stimuli with preferred rather than with less preferred motion.
Key words: visual motion perception, electroencephalography (EEG), subjective preference, alpha wave, autocorrelation function (ACF), cross-correlation function (CCF)