Differing effects of prosaccades and antisaccades on postural stability

作者：Legrand Agathe^*; Mazars Karine Dore; Lazzareschi Julie; Lemoine Christelle; Olivier Isabelle; Barra Julien; Bucci Maria Pia

来源：Experimental Brain Research, 2013, 227(3): 397-405.

DOI：10.1007/s00221-013-3519-z

• Posture
• Eye movements
• Antisaccades
• Prosaccades
• Dual-task

The goal of the study was to examine the effect of different types of eye movements on postural stability. Ten healthy young adults (25 +/- A 3 years) participated in the study. Postural control was measured by the TechnoConceptA (c) platform and recorded in Standard Romberg and Tandem Romberg conditions while participants performed five oculomotor tasks: two fixation tasks (central fixation cross, without and with distractors), two prosaccade tasks toward peripheral targets displayed 4A degrees to the left or to the right of the fixation cross (reactive saccades induced by a gap 0 ms paradigm and voluntary saccades induced by an overlap 600 ms paradigm) and one antisaccade task (voluntary saccade made in the opposite direction of the visual target). The surface, the length, and the mean speed of the center of pressure were analyzed. We found that saccadic eye movements improved postural stability with respect to the fixation tasks. Furthermore, antisaccades were found to decrease postural stability compared to prosaccades (reactive as well as voluntary saccades). This result is in line with the U-shaped nonlinear model described by Lacour et al. (Neurophysiol Clin 38:411-421, 2008), showing that a secondary task performed during a postural task could increase (prosaccade task) or decrease (antisacade task) postural stability depending on its complexity. We suggest that the different degree of attentional resources needed for performing prosaccade or antisaccade tasks are, most likely, responsible for the different effect on postural control.

• 出版日期2013-6