Changes in perceived temporal variation due to context: Contributions from two distinct neural mechanisms
Changes in perceived temporal variation due to context: Contributions from two distinct neural mechanisms
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DOI：
10.1016/j.visres.2011.06.015
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发表时间：
2011-08-15
期刊：
影响因子：
1.8
通讯作者：
Shevell, Steven K.
中科院分区：
文献类型：
--
作者：
D'Antona, Anthony D.;Kremers, Jan;Shevell, Steven K.
对时变光的感知取决于周围区域内光的时间特性。调节这种横向相互作用的神经机制的位点是有争议的：神经机制已经被假定在LGN（Kremers等人，2004）或皮质水平（D'Antona & Shevell，2007）。为了确定神经位点，在感知的时间变化的变化进行了比较，同侧与对侧周围的背景。在这两种情况下，一个随时间变化的中心领域内观察到一个随时间变化的周围：中心和周围之间的相对相位是不同的。在同侧和对侧条件下，中央场的调制深度强烈依赖于中心和周围之间的相对相位。结果表明，横向相互作用所产生的一个弱单眼（可能LGN）和一个更强的中央（皮层）机制。单眼的贡献是类似的时间频率测试的范围内（约。3-12 Hz），而中心分量表现出低通时频选择性。(C)2011爱思唯尔有限公司保留所有权利。
The percept of a time-varying light depends on the temporal properties of light within the surrounding area. The locus of the neural mechanism mediating this lateral interaction is controversial: neural mechanisms have been posited at the LGN (Kremers et al., 2004) or cortical level (D'Antona & Shevell, 2007). To determine the neural locus, changes in perceived temporal variation were compared with ipsilateral versus contralateral surrounding context. In both cases, a temporally varying central field was viewed within a temporally varying surround: relative phase between center and surround was varied. Perceived modulation depth in the central field depended strongly on the relative phase between center and surround, in both the ipsilateral and contralateral conditions. The results revealed lateral interactions arising from both a weak monocular (plausibly LGN) and a stronger central (cortical) mechanism. The monocular contribution was similar over the range of temporal frequencies tested (approx. 3-12 Hz), while the central component showed low-pass temporal-frequency selectivity. (C) 2011 Elsevier Ltd. All rights reserved.