School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, 1151 Richmond St, London, ON N6A 3K7, Canada.
School of Psychological Science, University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia.
Brain Cogn. 2021 Nov;154:105808. doi: 10.1016/j.bandc.2021.105808. Epub 2021 Oct 9.
Minimally delayed (MD) saccades require inhibition of a prepotent response until a target is extinguished, and unlike the more extensively studied antisaccade task, do not require the additional cognitive component of vector inversion (i.e., 180° target spatial transposition). Here, participants completed separate blocks of MD and prepotent stimulus-driven saccades (i.e., respond at target onset) while cortical hemodynamics were measured via functional transcranial Doppler ultrasound. MD saccades produced longer and more variable reaction times (RT). In turn, MD and stimulus-driven saccade preparatory phase cortical hemodynamics increased and decreased, respectively, relative to baseline and the two conditions differed from one another throughout the preparatory phase. The longer RTs and increased cortical hemodynamics of MD saccades is taken to evince response complexity and the increased neural activity to accommodate response inhibition. To our knowledge, such findings provide the first work to examine the neural foundations of MD saccades.
最小延迟（MD）扫视需要抑制一个优势反应，直到目标消失，与更广泛研究的反扫视任务不同，它不需要额外的认知成分——向量反转（即，180°目标空间转换）。在这里，参与者在完成 MD 和优势刺激驱动扫视（即在目标出现时做出反应）的同时，通过功能 transcranial 多普勒超声测量皮质血液动力学。MD 扫视产生的反应时间（RT）更长且更可变。反过来，MD 和刺激驱动的扫视预备阶段皮质血液动力学分别增加和减少，与基线相比，两种情况在预备阶段都有所不同。MD 扫视的较长 RT 和增加的皮质血液动力学被认为表明了反应的复杂性，并且增加的神经活动适应了反应抑制。据我们所知，这些发现首次研究了 MD 扫视的神经基础。
