Fig. 1.

Flow diagram of gaze data processing. Raw gaze data is stored in a sliding window vector whose average value is shown as a gaze cursor in overt gaze feedback paradigms. A counter (c) increments for each consecutive updated sliding window data vector whose standard deviation is below a prespecified threshold (smax). The gaze status is identified as ‘fixation’ if a prespecified number (cmax) of consecutive sliding windows is reached. The average gaze position is thereafter tested for being within one of a given set of ROIs. The described procedure is typically run until a fixation was found within one of the given ROIs triggering a step forward in the experimental paradigm, e.g. the presentation of a new visual stimulus or the change of the gaze direction of a virtual character.