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\section{Stimulus}  \subsection{Construction}  The Stimulus is a repetitive Serpentine Hallway created using Google Sketchup. Each fragment of this hallway is S shaped with the length of the straight segments equal to the diameter of the curves and the total hallway consists of 9 - 10 such fragments stiched together. Unity3D Point lights of different colors are used to create the sense of progress in the map.