The Effect Of Visual-haptic Synchronism And Divided Attention In Spatial Constancy

The ability of the visual system to maintain spatial stability despite the continuous changes in sensory and motor inputs is called spatial constancy. The performance can be improved by the integration of visual and haptic information As the movement is initiated by the subject, the brain will transfer the internal copy from the center of motor controlling to the internal modal, which indicated the predicted target state. The internal modal can integrate the internal copy, feedback, visual and haptic information, form the stable perception. However, when the subject was passively moved, no motor commands and internal copy are produced. It means that the internal modal couldn’t get the information about self-state, and the brain couldn’t predict the change coursed self-movements.The first experiment of this study explored whether the synchronous visual-haptic information could take the place of internal copy partly to enhance the spatial constancy. The results revealed the haptic stimuli could improve the performance of identifying the moving numbers. The mechanism behind the phenomenon needs embedded neurophysiology research. The second and third experiments demonstrated the medium level of attention could improve the performance, and was independent of the modal. The extra information could attract the attention by the processing from bottom to up. On the one hand, it decreased the arousal directing to the target; on the other hand, the resource distributed to the controlled processing was reduced, the increased resource for the automatic processing could improve the performance. In addition, the processing of double stimuli might affect the single one because of the adaptation in visual channel, resulted to the improvement of the performance. While the adaptation couldn’t be confirmed in different modals due to the difference of the activated cortex regioa...