Fig. 3.

Comparison of multivoxel object and task responses. (A) Raw similarity matrices for the EVC, LO, pFs, and LPFC ROIs averaged across all participants. Each matrix is 48 × 48 cells (6 tasks × 8 objects), with each cell reflecting the correlation between a pair of conditions across two independent halves of the data. Solid lines denote borders between the two Task Types (physical, conceptual). Dashed lines denote borders between individual tasks. Note that the positive and negative correlations are generally well grouped by task, suggesting that information about task is manifest in the neural pattern of response of all visual ROIs as well as in LPFC. The colors are scaled from the highest (yellow) to lowest (cyan) correlation value in each matrix. (B) Organization of the similarity matrices. (C) Schematic matrices indicating how different effects would be manifest in the similarity matrices and how the decoding indices were calculated. Object information within task (Upper Left) is indicated by stronger correlations for the same object (black) than for different objects (gray). Object information across tasks (Upper Right) is indicated by stronger correlations for the same object in different tasks (black) compared with different objects (gray). Task type information (Lower Left) is indicated by stronger correlations between all conditions of the same task type (black), compared with those across task type (gray). Finally, task information (Lower Right) for each task type is indicated by stronger correlations between objects in the same task (black) compared with different tasks (gray).