Visual evoked potentials response to different colors and intensities

The purpose of this work is to study the effects of the street and traffic lights on the driver reaction in terms to enhance the traffic safety factor. To illustrate the changes in the human response to different colours and to study the effects of intensity on the amplitude and latency of the VEPs components, an experiment is conducted on healthy subjects with a normal or corrected to normal vision using a checkerboard stimulus to achieve the pattern reversal VEPs responses. All the Basic RGB colours (Red, Green Blue) and yellow were used and tested for three levels of intensity (Low, Medium and High). Ensemble Averaging for 100 trials is implemented to extract the VEPs from the electroencephalogram (EEG) background noise. Subjects are fixed to a flickering checkerboard, generating a Steady State VEP (SSVEP) at a frequency of (3.5 Hz). The P1 were extracted and compared. As a baseline the subject responses to the achromatic stimulus is first recorded then the colour study is conducted.