The data set includes eye tracking data from 20 (9 advanced, 11 grassroots) Dutch dressage judges, assessing Grand Prix tests from video. Judges’ eye movements were recorded using the Tobii Fusion Eye tracker (at 250Hz frequency).
For eye tracker analysis, Times of Interest (TOI) were determined for each video, including the beginning of each movement as defined in the FEI GP Dressage test. The Areas of Interest (AOIs) were drawn in the Tobii Pro Lab software, outlining separate areas of the horse or rider a judge may focus on while judging. These areas were subsequently combined into four AOIs (Figure 1): Front (of the horse), Back (of the horse), Rider and (Horse’s) Feet.
Tobii Pro Lab uses a filtering algorithm to process gaze data. It classifies eye movement based on the velocity of the directional shifts of the eye. The velocity is the most commonly given in visual degrees per second(°/s). When the eye movement velocity is below a certain threshold, the samples are classified as part of a fixation. For the current study the Tobii Pro I-VT filter was set at a threshold of 30 degrees/second. Total Number of Fixations (TNF) and Total Duration of Fixations (TDF) were recorded for each of the four AOIs. The Average Duration of Fixation (ADF) was calculated by dividing the TDF by TNF. These eye tracking parameters were subsequently used to determine visual gaze strategies of dressage judges.