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

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.
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
Variables in the files are presented in the following order:
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

数据文件以日期、学科代码、日期和任务条件命名。存在四种不同的条件：暴露、基线、DCS和测试。暴露是指在n-back任务上的简短训练。基线是3-back任务中的5分钟时段。暴露和基线仅在第一天进行。DCS代表直流电刺激，指在参与者接受刺激时进行的3-back任务（10分钟）。测试条件（10分钟的3-back）发生在刺激后。DCS和测试条件在第一天和第二天进行。例如：01-Jan-2012_AA01_1_DCS表示第一天刺激期间的表现；01-Jan-2012_AA01_2_Test表示第二天刺激后测试阶段的表现。文件中的变量按以下顺序呈现：shudaprsd = 表示屏幕上的字母与3-back字母相同（1）或不同（0）的实例；key_press = 按下的键（6 = F，屏幕上的字母与3-back不同；8 = h，屏幕上的字母与3-back相同）；instructions = 指令出现在屏幕上的时间相对于文件开始的相对时间；fixation = 第一个注视点出现在屏幕上的时间相对于文件开始的相对时间；letter_onscreen = 字母出现在屏幕上的时间相对于文件开始的相对时间；stimulus_interval = 注视点消失的时间相对于文件开始的相对时间；RT = 从刺激开始到按键的反应时间（以秒计）；Hits = 正确命中次数（3-back）；CRs = 正确拒绝次数；FAs = 错误警报，在不正确的时候按下命中按钮；Misses = 错误拒绝命中试验（与错误警报相反）；or = 省略的拒绝反应；oh = 省略的命中反应；HR = 命中率，计算为命中次数与机会的比率；FAR = 错误警报率，计算为错误警报次数与机会的比率；Z_HR = Z标准化的命中率，其中Z是累积高斯分布的逆；Z_FAR = Z标准化的错误警报率，其中Z是累积高斯分布的逆；d = d'，计算为Z_HR - Z_FAR。