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arXiv 1503.01216q-bio.NC
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存在测量和刺激相关性时的视觉决策

Visual Decisions in the Presence of Measurement and Stimulus Correlations

Manisha Bhardwaj, Sam Carroll, Wei Ji Ma, Kresimir Josic

摘要:

人类和其他动物根据嘈杂的感官输入做出决定。因此,许多工作都致力于理解这些决定背后的计算。这个问题已经在各种各样的任务和不同复杂性的刺激中进行了研究。然而,感官噪声的相关性对感知判断的影响还没有得到很好的理解。在这里,我们研究如何刺激的相关性与感官噪音的相关性影响决策。作为一个例子,我们考虑的任务,检测一个或多个目标之间的干扰。我们假设干扰物和观察者对刺激的测量是相关的。在这个任务中,最优观察者的计算是不平凡的,但可以直观地分析和理解。我们发现,当干扰是强相关的,测量相关性可以有很大的影响性能。当干扰相关性弱时,测量相关性几乎没有影响,除非刺激的数量很大。因此,结构化刺激的神经反应的相关性可以强烈影响感知判断。

英文摘要:

Humans and other animals base their decisions on noisy sensory input. Much work has therefore been devoted to understanding the computations that underly such decisions. The problem has been studied in a variety of tasks and with stimuli of differing complexity. However, the impact of correlations in sensory noise on perceptual judgments is not well understood. Here we examine how stimulus correlations together with correlations in sensory noise impact decision making. As an example, we consider the task of detecting the presence of a single or multiple targets amongst distractors. We assume that both the distractors and the observer's measurements of the stimuli are correlated. The computations of an optimal observer in this task are nontrivial, yet can be analyzed and understood intuitively. We find that when distractors are strongly correlated, measurement correlations can have a strong impact on performance. When distractor correlations are weak, measurement correlations have little impact, unless the number of stimuli is large. Correlations in neural responses to structured stimuli can therefore strongly impact perceptual judgments.

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