2017年第二届曲阜视觉科学会议知识库

PURPOSE: Integrating different visual features into a coherent object is an essential issue for the visual system which is referred as the binding problem. Previous studies have shown that early visual cortex plays a very important role in the active binding of color and motion (Zhang et al., 2014; 2016). However, our knowledge of the relationship between the binding problem and the neural oscillations is still incomplete.
METHODS: We explored the role of neural oscillations in active color-motion binding with an illusory misbinding of color and motion (Wu et al., 2004). We probed the neural oscillations of the color-motion misbinding using electroencephalogram (EEG), and transcranial alternating current stimulation (tACS). Specifically, we presented a color-motion misbinding stimulus to subjects and recorded EEG signals while they reported whether they perceived the misbinding or the correct binding state.
RESULTS: Results showed that alpha oscillatory activity in left occipital area increased when subjects reported the correct binding state, relative to the misbinding state. Moreover, we used tACS over left posterior area to enhance individual alpha activity and found an increase in the duration of the correct binding state. Furthermore, we also manipulated alpha frequency to investigate the behavioral changes at different frequencies. We found that delivering a higher frequency than individual alpha frequency that we got from EEG signal would increase the switching rate between the misbinding and the correct binding state and vice versa.
CONCLUSIONS: We demonstrated that alpha activity can determine the color-motion binding and individual alpha activity causally shaped the perceptual states of the color-motion binding. Our results provide new insight for the neural mechanisms of active color-motion binding in human visual cortex.