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Fig. 1 | The Journal of Physiological Sciences

Fig. 1

From: Enhancement of pain inhibition by working memory with anodal transcranial direct current stimulation of the left dorsolateral prefrontal cortex

Fig. 1

Modified n-back task. Participants performed a modified n-back task in which they had to discriminate the color of each visual stimulus constituted of two squares which were either both blue or both yellow. In the 0-back condition, participants discriminated the color of the current stimulus directly after its presentation; in the 2-back condition, they responded to the stimulus presented two trials before. The visual stimulus was preceded by a tactile stimulus in 83% of trials or by a painful stimulus in the remaining trials (17%). Bottom left panel Sequential timings of stimuli in each trial. A fixation cross was present at the center of the screen during the entire trial. Electrical stimuli were followed by a visual stimulus of 500 ms duration. The interval between the somatosensory and visual stimuli (ISI) was 220 ms for the tactile trials and 300 ms for the painful trials. Performance in the modified n-back task was measured in the time window running from 150 to 1500 ms after onset of the visual stimulus. The next trial started at a latency set so that the inter-trial interval (ITI) measured between the onsets of two consecutive visual stimuli was 3000 ms

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