Digital conversion of the measured analog signal is accomplished with an 8 bit digitizer. EEGs are visually inspected and discriminated to eliminate those time series' which contain optical and muscular artifacts.
Spatial behavior is examined by accumulating data at various scalp locations.
The standard international 10-20 system for electrode placement is utilized, resulting in 19 simultaneous EEG measurements. Example Datasets Here are four sample datasets. Each dataset consists of 19 columns corresponding to the 19 channels. The sampling rate is 128 Hz.