What a difference a parameter makes: a psychophysical comparison of random dot motion algorithms.

What a difference a parameter makes: a psychophysical comparison of random dot motion algorithms.
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DOI:
10.1016/j.visres.2009.03.019
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发表时间:
2009-06
期刊:
影响因子:
1.8
通讯作者:
Seitz, Aaron R.
Seitz, Aaron R.
中科院分区:
心理学3区
文献类型:
--
作者:
Pilly, Praveen K.;Seitz, Aaron R.

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随机点运动(RDM)显示器已成为一个标准的刺激类型,在心理物理和生理研究的运动处理。RDM是方便的,因为它是简单的操纵相对运动能量为一个给定的运动方向,除了刺激参数,如速度,对比度,持续时间,密度,孔径等,然而,广泛的RDM采用,所以他们在他们的实施细节不同。因此,通常很难对采用不同RDM算法和参数的研究进行直接比较。在这里,我们系统地测量人类受试者的能力,以估计运动方向的四个常用的RDM算法下的一系列参数,以了解这些不同的算法比较,在他们的感知。我们发现,参数和算法的差异可以产生显着不同的性能。这些效果,而令人惊讶的,可以理解的相关神经生理学数据的时空位移调谐性能的细胞在MT区,以及如何调整功能的变化与刺激对比度和视网膜偏心。这些数据有助于提供一个基线,不同的RDM算法可以进行比较,证明需要清楚地报告RDM的详细信息的方法的文件,也提出了新的约束和挑战的模型的运动方向处理。
Random dot motion (RDM) displays have emerged as one of the standard stimulus types employed in psychophysical and physiological studies of motion processing. RDMs are convenient because it is straightforward to manipulate the relative motion energy for a given motion direction in addition to stimulus parameters such as the speed, contrast, duration, density, aperture, etc. However, as widely as RDMs are employed so do they vary in their details of implementation. As a result, it is often difficult to make direct comparisons across studies employing different RDM algorithms and parameters. Here, we systematically measure the ability of human subjects to estimate motion direction for four commonly used RDM algorithms under a range of parameters in order to understand how these different algorithms compare in their perceptibility. We find that parametric and algorithmic differences can produce dramatically different performances. These effects, while surprising, can be understood in relationship to pertinent neurophysiological data regarding spatiotemporal displacement tuning properties of cells in area MT and how the tuning function changes with stimulus contrast and retinal eccentricity. These data help give a baseline by which different RDM algorithms can be compared, demonstrate a need for clearly reporting RDM details in the methods of papers, and also pose new constraints and challenges to models of motion direction processing.
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