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A comparison of bounded diffusion models for choice in time controlled tasks

Zhang, Jiaxiang, Bogacz, Rafal and Holmes, Philip 2009. A comparison of bounded diffusion models for choice in time controlled tasks. Journal of Mathematical Psychology 53 (4) , pp. 231-241. 10.1016/

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The Wiener diffusion model (WDM) for 2-alternative tasks assumes that sensory information is integrated over time. Recent neurophysiological studies have found neural correlates of this integration process in certain neuronal populations. This paper analyses the properties of the WDM with two different boundary conditions in decision making tasks in which the time of response is indicated by a cue. A dual reflecting boundary mechanism is proposed and its performance is compared with a well-established absorbing boundary in the cases of the WDM, the WDM with extensions, and the WDM with prior probability. The two types of boundary influence the dynamics of the model and introduce differential weighting of evidence. Comparisons with Ornstein–Uhlenbeck models are also done, and it is shown that the WDM with both types of boundary achieves similar performance and produces similar fits to existing behavioural data. Further studies are proposed to distinguish which boundary mechanism is more consistent with experimental data.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Q Science > QA Mathematics
Uncontrolled Keywords: Choice; Decision; Diffusion model; Reflecting boundaries; Absorbing boundaries
Publisher: Elsevier
ISSN: 0022-2496
Last Modified: 04 Jun 2017 07:52

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