Fig. 4.

Schematic representation of two-level model of information processing. The belief about the probability of an option being correct increases as the participant sees more feedback over the course of several trials (bottom). On each individual trial, this probability is converted into a choice by setting the drift rate in the diffusion model (top). In this model, there are two potential points at which the participant’s preference could influence her behavior: the prior in the learning process, which affects the drift rate, and the bias in the starting point of the choice process, both highlighted in red. We model these influences as softmax functions of the difference in the participant’s bids for the correct and incorrect items (Δv), with inverse temperatures β _Δv (prior) and κ (choice bias)