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Alertness level evaluation has obvious implications for safety–critical occupations such as operators in control rooms or drivers. It has already been stated that alertness can be assessed objectively by EEG. However, the high costs of standard medical equipment for EEG measurement, their complex and timeconsuming operation, and the need to use conductive gel on the scalp make this method impossible for general use or at workstations. The aim of the study was to analyze the possibility of alertness level assessment based on EEG measurements using the Emotiv EPOC headset, which is relatively cheap, wireless, comfortable for wearing and does not need the use the of conductive gel, but allows the capture of only 14 channels of EEG. The experiments were carried out in laboratory conditions using three different light spectra for 40 minutes exposure on office workstation during the afternoon drop in alertness. 50 participants took part in each light scene (white, red, blue). The EEG measurements were performed before exposure and just after exposure to a particular light scene. A new measure of alertness, based on analysis of EEG signals, has been introduced. The results showed that this new measure based on low-cost Emotiv EPOC EEG measurements is reliable and confirms the results of previous studies.

New EEG Measure of the Alertness Analyzed by Emotiv EPOC in a Real Working Environment