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Modeling decision processes of travelers is done often by describing it in mathematical terms. The limitations of that approach are that only descriptive (and often even only normative) and no explanatory models are developed. The decision behavior of travelers in uncertain conditions appears to have features that are difficult to catch in the usual mathematical framework based on the utility concept. This paper proposes another approach--to model the decision process in neural functions in the body and the brain. The modeling in terms of neural processes is derived from research in literature on the behavior of persons in comparable situations executing tasks that are similar to the decisions of choosing routes and departure time in uncertain travel conditions. Brain activities and emotions appear to be related. This is represented in the somatic marker model. This model is a suitable framework to describe how people choose between uncertain options using limited information. The emotional state influences the decision process by making certain choices more probable. The paper describes the hypotheses and a research plan how to validate these by using neuroimaging techniques. Brain scans with functional MRI are planned for the measuring of brain activities during and after the decision processes and emotions will be measured by monitoring heart frequency and skin resistance.
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