EEG dataset for evaluation of a single-session SIT effect in healthy aging

Thirteen young adults (YA group, mean age 25.5, SD 5.3, 4F/9M) and eleven elderly adults (EA group, mean age 64.2, SD 7.1, 4F/7M) were recruited for the study. All subjects had no medical history of the neural pathological conditions, i.e., stroke, head trauma or tumors.Each subject underwent the sensorimotor integration training (SIT) procedure which consisted in N repetitions of elementary sensorimotor integration task. The task required the participants to classify the duration of presented audio stimulus and execute of one of the motor actions (ME) depending on its duration. Specifically, the participant should clench left or right hand into a fist in response to short (SAS) or long (LAS) audio stimulus. The durations of SAS and LAS were 300 ms and 750 ms, respectively. During ME the hand should be held clenched until the next audio stimulus of the same duration, which informed the participant about the end of ME. The time interval required for SI and ME within single trail was chosen randomly in the range 4--5 s. The pause between the trials was also picked randomly within the range 6--8 s. See Fig. 1A for a single trial timeline. The audio stimuli were presented via audio speakers located on the table in front of the participant. During SIT each participant performed N=60 SI task repetitions (30 per stimulus). The overall duration of the experimental session was approximately 10 minutes per participant.The raw EEG recordings were filtered using the 50 Hz Notch filter. Additionally, the data were filtered using the 5th-order Butterworth filter in the range 1-100 Hz to remove low-frequency artifacts. The ocular and cardiac artifacts were removed using the independent component analysis (ICA). The filtered time-series were segmented into 60 epochs 6 s long each according to the experiment protocol. Each epoch included 3 s of prestimulus EEG and 3 s of poststimulus EEG centered at the presentation of the first audio stimulus. To evaluate the effect of SIT on cortical activation with trial progression the timeline of experimental session (N=60 epochs total, 30 per stimulus) was divided into four equal Intervals: T1 (epochs 1-15); T2 (epochs 16-30); T3 (epochs 31-45); T4 (epochs 46-60). Thus, the interval T1 represented early phase, while the interval T4 represented the last phase of the experiment. The data was then inspected manually and the epochs with the remaining artifacts were rejected. Finally, each interval contained 10 artifact-free epochs (5 epochs per stimulus), 40 total. See Fig. 1B for sampling epochs into sets.Individual epochs for each subject are stored in the attached ._epo.fif files for Python MNE package for M/EEG analysis. Prefix EA or YA in the name of the file identifies the age group, which subject belongs to. Postfix T1, T2, T3 or T4 in the name of the file indicates the interval of SIT.