Kurylo Daniel D, Chung Caroline, Yeturo Sowmya, Lanza Joseph, Gorskaya Arina, Bukhari Farhan
Department of Psychology, Brooklyn College CUNY, Brooklyn, NY 11210, United States.
Department of Psychology, Brooklyn College CUNY, Brooklyn, NY 11210, United States.
Vision Res. 2015 Jan;106:20-6. doi: 10.1016/j.visres.2014.10.031. Epub 2014 Nov 20.
Early visual processing in rats is mediated by several pre-cortical pathways as well as multiple retinal ganglion cell types that vary in response characteristics. Discrete processing is thereby optimized for select ranges of stimulus parameters. In order to explore variation in response characteristics at a perceptual level, visual detection in rats was measured across a range of contrasts, spatial frequencies, and durations. Rats responded to the onset of Gabor patches. Onset time occurred after a random delay, and reaction time (RT) frequency distribution served to index target visibility. It was found that lower spatial frequency produced shorter RTs, as well as increased RT equivalent of contrast gain. Brief stimulus presentation reduced target visibility, slowed RTs, and reduced contrast gain at higher spatial frequencies. However, brief stimuli shortened RTs at low contrasts and low spatial frequencies, suggesting transient stimuli are more efficiently processed under these conditions. Collectively, perceptual characteristics appear to reflect distinctions in neural responses at early stages of processing. The RT characteristics found here may thereby reflect the contribution of multiple channels, and suggest a progressive shift in relative involvement across parameter levels.
大鼠早期视觉处理由几种皮层下通路以及多种在反应特性上存在差异的视网膜神经节细胞类型介导。由此，离散处理针对特定范围的刺激参数进行了优化。为了在感知层面探究反应特性的变化，在一系列对比度、空间频率和持续时间范围内测量了大鼠的视觉检测能力。大鼠对伽柏补丁的出现做出反应。出现时间在随机延迟后发生，反应时间（RT）频率分布用于指示目标可见性。研究发现，较低的空间频率会产生较短的反应时间，以及增加相当于对比度增益的反应时间。短暂的刺激呈现会降低目标可见性，减慢反应时间，并在较高空间频率下降低对比度增益。然而，短暂刺激在低对比度和低空间频率下会缩短反应时间，这表明在这些条件下，瞬态刺激能得到更有效的处理。总体而言，感知特性似乎反映了处理早期阶段神经反应的差异。此处发现的反应时间特性可能因此反映了多个通道的贡献，并表明在不同参数水平上相对参与度的渐进性转变。
