In the redundant signals task, two target stimuli are associated with the same response. If both targets are presented together, redundancy gains are observed, as compared with single-target presentation. Different models explain these redundancy gains, including race and coactivation models (e.g., the Wiener diffusion superposition model, Schwarz, 1994, Journal of Mathematical Psychology, and the Ornstein Uhlenbeck diffusion superposition model, Diederich, 1995, Journal of Mathematical Psychology). In the present study, two monkeys performed a simple detection task with auditory, visual and audiovisual stimuli of different intensities and onset asynchronies. In its basic form, a Wiener diffusion superposition model provided only a poor description of the observed data, especially of the detection rate (i.e., accuracy or hit rate) for low stimulus intensity. We expanded the model in two ways, by (A) adding a temporal deadline, that is, restricting the evidence accumulation process to a stopping time, and (B) adding a second "nogo" barrier representing target absence. We present closed-form solutions for the mean absorption times and absorption probabilities for a Wiener diffusion process with a drift towards a single barrier in the presence of a temporal deadline (A), and numerically improved solutions for the two-barrier model (B). The best description of the data was obtained from the deadline model and substantially outperformed the two-barrier approach.

中文翻译：

---

不同强度和延迟的视听检测

在冗余信号任务中，两个目标刺激与相同的响应相关联。如果两个目标一起呈现，与单目标呈现相比，可以观察到冗余增益。不同的模型解释了这些冗余增益，包括种族和共激活模型（例如，维纳扩散叠加模型，Schwarz，1994，数学心理学杂志，和奥恩斯坦乌伦贝克扩散叠加模型，Diederich，1995，数学心理学杂志）。在本研究中，两只猴子利用不同强度和起始异步的听觉、视觉和视听刺激执行了简单的检测任务。在其基本形式中，维纳扩散叠加模型仅提供了对观察数据的较差描述，尤其是低刺激强度的检测率（即准确性或命中率）。我们以两种方式扩展了模型，（A）添加了一个时间期限，即将证据积累过程限制在一个停止时间，（B）添加了第二个代表目标缺失的“nogo”障碍。我们提出了在存在时间期限的情况下向单个势垒漂移的维纳扩散过程的平均吸收时间和吸收概率的封闭式解 (A)，以及双势垒模型的数值改进解 (B) 。数据的最佳描述是从截止日期模型获得的，并且大大优于两屏障方法。