Figure 2.

DDM of effort-based decision making for reward. (A) Model assumes decisions to accept offers arise from a noisy process of evidence accumulation up to a decision boundary, a, at a drift rate, V and starting point of evidence accumulation termed the bias, z. The final term accounts for non-decision time components, t. (B) Both reward and effort significantly alter drift rate but reward has a significantly greater impact than effort. (C) Overview of how drift rate (black arrow) varies with each unique combination of reward and effort posed by our task. The drift rate incrementally rises with increasing reward (left to right), and falls with increasing effort (from bottom to top).