3-back scores of participants before, during and after tDCS stimulation to their left dorsolateral prefronatal cortex

<p>Files are named by date, subject code, day and task condition. There are four different conditions: Exposure, Baseline, DCS and Test. Exposure was a brief training on the n-back task. Baseline was a 5 minute period of the 3-back. Exposure and Baseline occurred only on day 1. DCS stands for direct current stimulation and indicates performance of the 3-back (10 minutes) that occurred while participants were stimulated. The test condition (10 minutes of 3-back) occurred post-stimulation. Both DCS and the Test conditions occurred on days 1 and 2.</p> <p>For example: 01-Jan-2012_AA01_1_DCS - indicates the performance during stimulation on day 1 01-Jan-2012_AA01_2_Test - indicates the performance during post-stimulation test phase on day 2</p> <p>Variables in the files are presented in the following order:</p> <p>shudaprsd = indicates instances where the letter on screen was the same as the letter 3-back (1) or not (0) key_press = the key pressed (6 = F, letter on screen is not the same as 3-back; 8 = h, letter on screen is the same as letter 3-back) instructions = time relative to the start of the file when the instructions appeared on screen fixation = time relative to the start of the file when the first fixation cross appeared on screen letter_onscreen = time relative to the start of the file when the letter appeared on screen stimulus_interval = time relative to the start of the file when the fixation cross disappeared off screen RT = reaction time in seconds from the time stimulus onset to the button press Hits = the amount of correct hits (3-back) CRs = the number of correct rejections FAs = false alarms, pressing the hit button at the wrong occasion Misses = incorrect rejection of hit trial (opposite to false alarm) or = omitted rejection response oh = omitted hit response HR = hit rate calculated as the number of hits per chances FAR = false alarm rate calculated as the number of false alarms per opportunity Z_HR = Z normalised hit rate, where Z is the inverse of the cumulative Gaussian distribution Z_FAR = Z normalised false alarm rate, where Z is the inverse of the cumulative Gaussian distribution d = d prime calculated as Z_HR - Z_FAR</p>