2. Related work
2.1. EEG model
Cerebral signals, recorded by an EEG recording system, result from neural firing activities. On the other hand, EOG artifacts are non-cerebral activities spreading over the entire recording scalp and contaminating the EEG electrode recordings. For that reason, an EEG recording can be represented as a superposition of a true EEG signal and some portions of the artifacts. When an EOG artifact presents, it is assumed that the model for the contaminated EEG signal is in the following form [17],