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+## About Dataset
+### Recording Method :
+Neurocom EEG 23-channel system (21 channels were selected finally) where used to record the EEGs monopolarly from 36 subjects. A high-pass filter with a 30 Hz cut-off frequency and a power line notch filter (50 Hz) were used. All recordings are artifact-free EEG segments of 60 seconds duration. At the stage of data preprocessing, the Independent Component Analysis (ICA) was used to eliminate the artifacts.
+
+### Data
+The data files with EEG are provided in EDF (European Data Format) format. Each subject has 2 files:
+with "_1" suffix -- the recording of the background EEG of a subject (before mental arithmetic task)
+with "_2" suffix -- the recording of EEG during the mental arithmetic task.
+In this experiment all subjects are divided into two groups:
+Group "G" (24 subjects) performing good quality count (Mean number of operations per 4 minutes = 21, SD = 7.4).
+Group "B" (12 subjects) performing bad quality count (Mean number of operations per 4 minutes = 7, SD = 3.6).
+In subject-info.csv, the "Count quality" column indicates which subjects correspond to which group (0 - Group "B", 1 - Group "G"). Additionally, subject-info.csv provides basic information about each subject (gender, age, job, date of recording).
+
+### Contributors
+This database was contributed by Igor Zyma, Sergii Tukaev, and Ivan Seleznov, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Department of Electronic Engineering.
+
+For further information, please contact:
+Ivan Seleznov
+National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Department of Electronic Engineering.
+ivan.seleznov1@gmail.com
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