The diffusion model (Ratcliff, 1978) and the leaky competing accumulator model (LCA, Usher & McClelland, 2001) were tested against two-choice data collected from the same subjects with the standard response time procedure and the response signal procedure. In the response signal procedure, a stimulus is presented and then, at one of a number of experimenter-determined times, a signal to respond is presented. The models were fit to the data from the two procedures simultaneously under the assumption that responses in the response signal procedure were based on a mixture of decision processes that had already terminated at response boundaries before the signal and decision processes that had not yet terminated. In the latter case, decisions were based on partial information in one variant of each model or on guessing in a second variant. Both variants of the diffusion model fit the data well and both fit better than either variant of the LCA model, although the differences in numerical goodness-of-fit measures were not large enough to allow decisive selection between the models.

中文翻译：

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建模响应信号和响应时间数据☆

扩散模型 (Ratcliff, 1978) 和泄漏竞争累加器模型 (LCA, Usher & McClelland, 2001) 针对从相同受试者收集的两项选择数据进行了测试，这些数据采用标准响应时间程序和响应信号程序。在响应信号过程中，呈现刺激，然后在实验者确定的多个时间之一呈现响应信号。在假设响应信号过程中的响应基于在信号之前已经在响应边界处终止的决策过程和尚未终止的决策过程的混合的假设下，模型同时拟合来自两个过程的数据。在后一种情况下，决策基于每个模型的一个变体中的部分信息或第二个变体中的猜测。