A comparison of single and multiple diffusion process models of continuous-outcome decision making.

Abstract

Continuous-outcome decision tasks, in which responses are made on continuous scales, are increasingly used to characterize the processes involved in speeded decision making. These tasks yield entire distributions of response errors rather than just error proportions. Two diffusion process models of continuous-outcome decisions have recently been proposed, the circular diffusion model, and the spatially continuous diffusion model, which generalize the two main classes of diffusion process models of two-choice decisions to continuous spaces. The circular diffusion model, which generalizes the two-boundary Wiener model, assumes evidence is accumulated by a two-dimensional Wiener process with a ..