Figure 1.

The three fixation target conditions used in this study; a red fixation point (A), an animation video (B), and a counting task (C). Children were seated in a chair where the headset was positioned. A picture of a participant at home (6 years old) is shown in (D). All fixation targets were displayed at a fixed position in the middle of a dark blue virtual reality environment. The 2 Hz flickering yellow-and black stimuli consecutively appeared at the 20 stimulus locations (E). To ensure accurate retinotopic stimulation stimuli were presented in a gaze-contingent manner (F), i.e., online correction of stimulus locations for saccades from fixation target. Note that thin white lines were added to the background to create a sense of depth in the virtual reality environment. Note that the green gaze position cross was not shown during the experiment but is here shown to illustrate the gaze-contingent presentation paradigm.