Figure 1. Schematic representation of cognitive task paradigm, procedure for creating task-specific timecourses and mean task-specific correlation matrices. a, Task blocks begin with the presentation of a task-set cue (M, R, or P) specifying which task (Memory, Reasoning, or Perception) should be performed during the following four trials. Each trial consists of a four-word array, and participants have 8 s to respond with a button press. Trials were separated by brief periods of resting fixation. After the end of each four-trial task block, a new task-set cue appears, followed by four trials of the new task. b, Task-specific timecourses were created by concatenating task blocks (twenty-four 38 s blocks per task) for each node, excluding cue-period activity. In this schematic example, three Reasoning task blocks were concatenated. c, Mean correlation matrices illustrate the pairwise correlations among all 264 nodes for each task, averaged across participants. The colored bands along the top of each plot indicate the network membership of the 264 nodes, as specified by Power et al. (2011).