Figure 4.

Representation of quality, quantity, and their interaction. A, We observed bilateral coding of offer quality (Quality_High − Quality_Low) bilaterally in the IFG. B, Increasing quantity, as tested by Quantity_HighQuality + Quantity_{MediumQuality} + Quantity_LowQuality, was associated with greater activity bilaterally in the IPS. C, Activations in the posterior cingulate cortex were consistent with representing the interaction of quality and quantity but not either variable separately (Quantity_HighQuality − Quantity_LowQuality). Errors bars represent the SEM across subjects, SPM values were thresholded at p < 0.01 for visualization.