Redondo Beatriz, Vera Jesús, Luque-Casado Antonio, García-Ramos Amador, Jiménez Raimundo
Department of Optics, Faculty of Sciences, University of Granada, Granada, Spain.
Department of Optics, Faculty of Sciences, University of Granada, Granada, Spain.
Vision Res. 2019 Oct;163:24-32. doi: 10.1016/j.visres.2019.07.001. Epub 2019 Aug 28.
This study evaluated the time-on-task effect of a sustained attention task on the accommodative response, explored the link between ocular accommodation, cardiac autonomic regulation and behavioral performance, and tested the inter-session repeatability of these results by performing the same experimental procedure on different days. The accommodative response was measured in 25 university students using a WAM-5500 autorefractor, while participants performed a 10-minute psychomotor vigilance task at 50 cm. There were no time-on-task effects for the lag of accommodation, whereas the microfluctuations of accommodation and reaction time were modulated as a function of time-on-task, observing a progressive increment of both variables over time. Multiple regression analysis revealed that the microfluctuations of accommodation were a reasonably good predictor of behavioral performance. Analysis of inter-session repeatability showed that ocular accommodation, heart rate variability and reaction time had a low to moderate level of repeatability between two measurements. The microfluctuations of accommodation were sensitive to time-on-task effects during sustained attention, with a lower stability of accommodation being linked to reduced behavioral performance. The predictive capacity of the variability of accommodation for behavioral performance might be explained by the brain mechanisms shared by the ocular dynamics and attentional state; however, future studies would be required to elucidate this association. The low to moderate inter-session repeatability indicated that results in two measurement periods cannot be considered interchangeable, and therefore, the results of this study should be interpreted cautiously in this regard.
本研究评估了持续注意力任务对调节反应的任务执行时间效应，探讨了眼调节、心脏自主神经调节与行为表现之间的联系，并通过在不同日期执行相同的实验程序来测试这些结果的会话间重复性。使用WAM - 5500自动验光仪对25名大学生的调节反应进行测量，同时参与者在50厘米处执行10分钟的心理运动警觉任务。调节滞后不存在任务执行时间效应，而调节的微波动和反应时间则根据任务执行时间进行调节，观察到这两个变量随时间逐渐增加。多元回归分析表明，调节的微波动是行为表现的一个相当好的预测指标。会话间重复性分析表明，眼调节、心率变异性和反应时间在两次测量之间具有低到中等程度的重复性。在持续注意力期间，调节的微波动对任务执行时间效应敏感，调节稳定性较低与行为表现下降有关。调节变异性对行为表现的预测能力可能由眼动动力学和注意力状态共享的脑机制来解释；然而，需要未来的研究来阐明这种关联。低到中等程度的会话间重复性表明，两个测量期的结果不能被认为是可互换的，因此，在这方面本研究的结果应谨慎解释。
