Alterations of Eye Movement Control in Neurodegenerative Movement Disorders
Figure 1
Illustration of cognitive demanding oculomotor tasks in order to assess attentional control. (a) In delayed saccades, subjects are asked to fixate the spot (I) and to withhold their gaze shift towards a new randomly appearing target (II) until an acoustic “cue” is sounded (III). The “run” is finished when the old target varnishes (IV). (b) The antisaccade task requires the subject to focus on the center position (I) until a new target (grey) presents randomly at either the right or the left eccentric position (II). The subject is immediately asked to shift the gaze to the contralateral half-plane (away from the target). The “run” is completed by shifting the gaze back onto the central position (III). Black dotted arrows illustrate the required gaze shift.
