Borsellino A, Carlini F, Riani M, Tuccio M T, De Marco A, Penengo P, Trabucco A
Perception. 1982;11(3):263-73. doi: 10.1068/p110263.
Reversal rates of an ambiguous figure (the Necker cube) were studied for different pattern sizes covering a range of visual angles theta from approximately 1 to 62 deg. A large number of reversals was obtained for each observer and each pattern in order to examine the statistical distributions of reversal times. A pronounced flattening of the statistical distributions (represented throughout by a gamma distribution) and a growth of the mean duration of each percept, with increasing pattern size was found. A plateau in the range of theta between 5 and 20-30 deg was observed. For larger values of theta two kinds of observers have been identified: for 'fast' observers the inversion rate is little affected by theta, whilst for 'slow' observers, the mean reversal time increases strongly with theta. A tentative model, based on three different contributions to the duration of the alternation process, is proposed: a constant term, independent of theta, and two terms dependent on theta--a retinal term, and a cortical one. The last term is interpreted as due to the spreading of excitation with the characteristic of a filling-in process.
针对不同图案尺寸研究了模糊图形（内克尔立方体）的翻转率，这些图案尺寸涵盖了从约1到62度的一系列视角θ。为了检验翻转时间的统计分布，针对每个观察者和每个图案都获得了大量的翻转数据。结果发现，随着图案尺寸的增加，统计分布（始终用伽马分布表示）明显变平，且每个感知的平均持续时间增加。在5至20 - 30度的θ范围内观察到一个平稳期。对于较大的θ值，已识别出两种观察者：对于“快速”观察者，翻转率受θ的影响很小，而对于“缓慢”观察者，平均翻转时间随θ大幅增加。基于对交替过程持续时间的三种不同贡献，提出了一个初步模型：一个与θ无关的常数项，以及两个与θ有关的项——一个视网膜项和一个皮质项。最后一项被解释为由于具有填充过程特征的兴奋扩散所致。
