Eye Tracking of Vegetable Shipping Line Graph Testing Survey

Survey results were recorded manually into 2017_01_13_survey_response_data.csv. Any outliers were removed in data post-processing, not provided here. Therefore, any user of this data will need to remove outliers themselves. Eye-tracking methods: Participants were fitted with an Eye link II tracker headset (sampling rate 500Hz), which recorded eye movements of the right eye as they completed the survey on a 21-inch colour desktop PC (refresh rate of 75Hz). A chin rest was used to constrain any head movements and participants were placed in a set position. The distance between the monitor and participant was 57 cm. In this study, we monitored the location and duration of eye fixations, defined as a maintained gaze (the eye was still, i.e. no saccades were detected) on one location. A standard 9-point grid was used to calibrate eye movements at the beginning of the study. All participants calibrated successfully and calibration was maintained for each question using a drift correct.