Fig 1.
Each run started with a fixation cross followed by a written label indicating the response rule: color or forma (shape in Spanish). Subsequent trials started with a switch cue (vertical dollar sign), which indicated a change in the response rule, or a repeat cue (horizontal dollar sign), which indicated repetition of the response rule. The cue was followed by a variable number (8–12) of response stimuli (blue and red circles and squares). The cue always referred to the response rule of the previous trial, independently of the instructions presented at the beginning of the run.
Table 1.
Means and Standard Deviations of RTs, Switch Costs and Error Rates.
Fig 2.
Average activation maps for the Switch > Repeat contrast overlaid on a standard brain (p < .05, cluster corrected with an auxiliary uncorrected threshold of p < .001). The right side of the image is the right side of the brain. The color bar depicts t values. PCC = posterior cingulate cortex; ACC = anterior cingulate cortex; IFG = inferior frontal gyrus.
Table 2.
Brain Areas Showing Greater Activity for the Switch Condition than the Repeat Condition.
Fig 3.
Whole-brain correlation maps between brain activity in the Switch > Repeat contrast and SR scores (p < .05, cluster corrected with an auxiliary threshold of p < .001). Color bars depict negative (blue-green) and positive (red-yellow) t values. The right side of the image is the right side of the brain. PCC = posterior cingulate cortex; ACC = anterior cingulate cortex; IFG: inferior frontal gyrus; DLPFC: dorsolateral prefrontal cortex.
Table 3.
Brain Areas Showing a Correlation between SR Scores and Activation in the Switch > Repeat Contrast.