Visual fixations and the computation and comparison of value in simple choice
Ian Krajbich1, Carrie Armel, Antonio Rangel
1Division of Humanities and Social Sciences, California Institute of Technology, Pasadena, California, USA.
Abstract:
Most organisms facing a choice between multiple stimuli will look repeatedly at them, presumably implementing a comparison process between the items' values. Little is known about the nature of the comparison process in value-based decision-making or about the role of visual fixations in this process. We created a computational model of value-based binary choice in which fixations guide the comparison process and tested it on humans using eye-tracking. We found that the model can quantitatively explain complex relationships between fixation patterns and choices, as well as several fixation-driven decision biases.
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