Comparing increment and decrement probes in the probed-sinewave paradigm.
Comparing increment and decrement probes in the probed-sinewave paradigm.
复制标题
比较正弦波探测范例中的增量探头和减量探头。
DOI：
10.1016/s0042-6989(01)00009-8
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发表时间：
2001
期刊：
影响因子：
1.8
通讯作者：
Graham,N
中科院分区：
文献类型：
--
作者：
Wolfson,SS;Graham,N
使用探测正弦波范例，我们探索了增量探头和减量探头在一定频率范围（大约 1-19 Hz）之间的差异。在此范例中，测量在大正弦闪烁背景（八个不同相位）上呈现的小型测试探针的检测阈值。增量和减量探针的探针阈值非常相似，但存在非常小的（系统性）差异：在背景强度增加的循环部分中，增量阈值通常相对于减量阈值稍高。尽管 Wilson (1997, Vis. Neuro., 14, 403–423) 模型大大低估了这种差异的大小，但它预测了一些相位依赖性。然而，威尔逊模型中是否存在通路和通路外对于这些预测并不重要。 Snippe、Poot 和 van Hateren (2000, Vis. Neuro., 17, 449–462) 最近的模型可能能够通过使用明确的对比度增益控制而不是单独的 On-path 和 Off-path 来预测这一结果。测量探针感知极性的辅助实验提供了进一步的论据，表明单独的接通和断开路径对于解释增量和减量探针阈值没有用。
Using the probed-sinewave paradigm, we explore the differences between increment and decrement probes across a range of frequencies (approx. 1–19 Hz). In this paradigm, detection threshold is measured for a small test probe presented on a large sinusoidally flickering background (at eight different phases). Probe thresholds are very similar for increment and decrement probes, but there is a very small (and systematic) difference: increment thresholds are usually slightly higher relative to decrement thresholds during the part of the cycle when the background's intensity is increasing. Although Wilson's (1997, Vis. Neuro., 14, 403–423) model substantially underestimates the size of this difference, it predicts some phase dependency. However, the existence of On- and Off-pathways in Wilson's model is not important for these predictions. A recent model by Snippe, Poot, and van Hateren (2000, Vis. Neuro., 17, 449–462) may be able to predict this result by using explicit contrast-gain control rather than separate On- and Off-pathways. Auxiliary experiments measuring the perceived polarity of the probe provide a further argument suggesting that separate On- and Off-pathways are not useful in explaining increment and decrement probe thresholds.