Bakouie Fatemeh, Pishnamazi Morteza, Zeraati Roxana, Gharibzadeh Shahriar
Institute for Cognitive and Brain Sciences, Shahid Beheshti University, Tehran, Iran.
Students' Scientific Research Center (SSRC), Tehran University of Medical Sciences, Tehran, Iran.
Cogn Neurodyn. 2017 Aug;11(4):319-326. doi: 10.1007/s11571-017-9434-4. Epub 2017 Mar 25.
When two eyes are simultaneously stimulated by two inconsistent images, the observer's perception switches between the two images every few seconds such that only one image is perceived at a time. This phenomenon is named binocular rivalry (BR). However, sometimes the perceived image is a piecemeal mixed of two stimuli known as piecemeal perceptions. In this study, a BR task was designed in which orthogonal gratings are presented to the two eyes. The subjects were trained to report 3 states: dominant perceptions (two state matching to perceived grating orientation) and the piecemeal perceptions (third state). We explored the scale-freeness of the BR percept durations considering the two dominant monocular states as well as the piecemeal transition state using detrended fluctuation analysis. Our results reproduced the previous finding of memory in the perceptual switches between the monocular perception states. Moreover, we showed that such memory also exists in the transitory periods of dichoptic piecemeal perceptions. These results support our hypothesis that the pool of unstable piecemeal perceptions could be regarded as separate multiple low-depth basin in the perceptual state landscape. Likewise, the transitions from these piecemeal state basins and stable monocular state basins are faced with resistance. Therefore there is inertia and memory (i.e. positive serial correlation) for the piecemeal dichoptic perception states as well as the monocular states.
当两只眼睛同时受到两个不一致图像的刺激时，观察者的感知会每隔几秒在两个图像之间切换，以至于每次只能感知到一个图像。这种现象被称为双眼竞争（BR）。然而，有时感知到的图像是两种刺激的零碎混合，即零碎感知。在本研究中，设计了一项BR任务，向两只眼睛呈现正交光栅。受试者接受训练以报告三种状态：主导感知（与感知到的光栅方向匹配的两种状态）和零碎感知（第三种状态）。我们使用去趋势波动分析，考虑两种主导单眼状态以及零碎过渡状态，探讨了BR感知持续时间的无标度性。我们的结果重现了先前关于单眼感知状态之间感知切换中存在记忆的发现。此外，我们表明这种记忆也存在于双眼零碎感知的过渡时期。这些结果支持了我们的假设，即不稳定的零碎感知集合可被视为感知状态景观中单独的多个低深度盆地。同样，从这些零碎状态盆地和稳定单眼状态盆地的转变面临阻力。因此，双眼零碎感知状态以及单眼状态存在惯性和记忆（即正序列相关性）。
