Figure 4.

Dissociation of value and salience signals during a decision-making task. Human participants were shown pictures of food items that ranged from being highly disliked to highly liked and were asked to make a choice whether or not they would like to eat the item after the experiment (participants in fact consumed these items following scanning). For each picture, participants entered their response on one of the four choices: “Strong No (St. No)”, “No”, “Yes” or “Strong Yes (St. Yes)”. These four types of responses were used to define value and salience signals. The value regressor was defined based on the parametric weights [−2 −1 1 2] and the salience regressor was defined based on the parametric weights [2 1 1 2] corresponding to the four choices above (in that order). (A) Evidence for value type signals found in the medial OFC. (B) Evidence for both value and salience type signals found in the VS. Adapted from Litt et al. (2011).