高速LED背光速视器揭示拓扑性质的快速加工

High Speed LED Backlight Tachistoscope Reveals Fast Processing of Topological Invariants

灵长类视觉系统能够非常有效地从环境中提取稳定的不变性特征,而不受各种变换与干扰的影响.这种不变性知觉的时间与动态过程为视觉理论提供了重要的约束.我们开发了一种高速发光二极管(LED)背光速视器,能够短暂呈现1 ms的视觉刺激,并以亚毫秒级精度调整刺激呈现时间.这使得我们可以通过控制视觉输入的可获取时间,估计感觉线索积累的心理物理曲线,从而研究在图形结构优势效应任务中,拓扑、射影、仿射和欧氏不变性的相对加工速度.实验结果表明拓扑不变性所需要的呈现时间最短,这与大范围首先理论的预测相一致.

Primate visual system is extremely efficient in extracting stable invariants from environment, despite various transformation and degradation. The timing and dynamics of invariants perception provide important constraints for theories of vision. We developed a high speed LED backlight tachistoscope capable to deliver visual stimuli with 1 ms exposure and adjust the duration in submillisecond precision, which enabled us to investigate the relative speed of processing topological, projective, affine, and Euclidean invariants in configural superiority effect paradigm by manipulating the access time to visual input and estimating the psychometric function for sensory evidence accumulation. The results suggest that topological invariant requires shortest exposure time, consistent with the prediction of global-first theory.