不同注意任务类型及难度对猕猴微眼动的影响

微眼动是视觉注视过程中幅度最大、速度最快的眼动,可以消除由于神经系统适应性而产生的视觉衰退现象,在视觉信息处理过程中发挥着重要作用.基于微眼动与视觉感知功能的相关性,设计实验研究猕猴完成显性、隐性注意任务以及不同难度显性注意任务时,视觉注视情况下微眼动的差异.通过对不同难度显性注意任务下微眼动的参数进行比较,发现随着任务难度的增加,微眼动的幅度、速率和频率都被抑制.另一方面,对比不同类型的视觉感知任务(显性注意和隐性注意),发现在相似的实验范式下,隐性注意对微眼动的频率有明显的抑制作用,但幅度和频率没有得到一致的结果,这表明视觉注意任务类型的不同或将导致猕猴完成任务的策略不同.这些工作将为今后进一步研究微眼动产生的神经机制以及视觉注意过程中眼动的作用机制奠定良好的基础.

The Effect of Attentional Task and Task Difficulty on Microsaccades in Macaques

Microsaccades are the largest and fastest of the fixational eye movements during attempted visual fixation. They can overcome visual fading that is due to neural adaptation and play an important role in the process of visual perception and cognition. We designed experiments to explore the difference of the microsaccades on the fixation tasks and attention tasks based on the correlation between microsaccades and visual perception. Comparing microsaccadic parameters in the different difficulty levels in fixation tasks, we found that amplitude, velocity and frequency of macaques' microsaccades are decreased with increasing task difficulty. On the other side, we don't get the same results on the two macaques on comparing the different visual tasks. It represents the different kind of visual tasks maybe lead to the different visual means. This conclusion will provide the basis for the further study on the mechanism of microsaccades.