随机点立体图视差信息加工的事件相关电位研究

An Event-related Potential Study the on Information Processing of Binocular Disparity in Random-dot Stereogram

目的研究以随机点立体图 (Random dotstereogram ,RDS)产生的精细立体视觉的非连续 -连续视差梯度类型、非交叉 -交叉视差交叉类型和大 -小视差对ERP的影响。方法采用 1 6名 ( 8男 ,8女 )深度知觉正常的被试 ,以红绿眼镜产生立体视觉 ,记录其行为及脑电数据。结果 1 )非连续视差梯度的反应正确率高于连续视差梯度 ;大视差条件的反应正确率高于小视差条件。 2 )非连续视差梯度较连续视差梯度诱发的N1 60潜伏期更短 ,N35 0的波幅更大 ;与非交叉视差相比 ,交叉视差的N35 0潜伏期较短 ;大视差比小视差具有更短的N1 60潜伏期和更大的P2 80波幅。结论不同视差梯度显著影响视差信息的加工 ,非连续视差梯度具有一定的加工优势 ;N1 60的潜伏期和P2 80的波幅与视差大小加工相关 ;N35 0成分还与视差交叉信息的加工相关。

Objective To study the effects of discontinuous-continuous disparity gradient, uncrossed-crossed disparity and small-large disparity in random-dot stereogram (RDS) on the event-related potentials (ERPs). Method Behavioral data and ERP were recorded when 16 healthy participants (8 males and 8 females) with normal depth perception were performing the task, in which the stereopsis were generated by red-blue glasses. Result 1) The accuracy in discontinuous disparity gradient was higher than that in continuous disparity gradient, and the accuracy in large disparity was higher than that in small one.2) Discontinuous disparity gradient elicited shorter N160 latency and larger N350 amplitude than continuous disparity gradient did. Compared with uncrossed disparity, crossed disparity elicited shorter N350 latency. In addition, large disparity elicited shorter N160 latency and larger P280 amplitude than small disparity did. Conclusion The effect of disparity gradient on disparity information processing is significant, and the discontinuous disparity gradient has its processing advantage. Latency of N160 and amplitude of P280 is correlated with the information processing of the size of disparity. N350 component is correlated with the information processing of the uncrossed-crossed information of disparity.