Heeman Jessica, Nijboer Tanja C W, Van der Stoep Nathan, Theeuwes Jan, Van der Stigchel Stefan
Experimental Psychology, Helmholtz Institute, Utrecht University, The Netherlands; Faculty of Behavioural and Movement Sciences: Cognitive Psychology Section, Vrije Universiteit, Amsterdam, The Netherlands.
Experimental Psychology, Helmholtz Institute, Utrecht University, The Netherlands; University Medical Center, Department of Neurology, Utrecht, The Netherlands; Rudolf Magnus Institute of Neuroscience and Center of Excellence for Rehabilitation Medicine, University Medical Center Utrecht and Rehabilitation Center De Hoogstraat, Utrecht, The Netherlands.
Vision Res. 2016 Jun;123:46-55. doi: 10.1016/j.visres.2016.04.002. Epub 2016 May 19.
When executing an eye movement to a target location, the presence of an irrelevant distracting stimulus can influence the saccade metrics and latency. The present study investigated the influence of distractors of different sensory modalities (i.e. auditory, visual and audiovisual) which were presented at various distances (i.e. close or remote) from a visual target. The interfering effects of a bimodal distractor were more pronounced in the spatial domain than in the temporal domain. The results indicate that the direction of interference depended on the spatial layout of the visual scene. The close bimodal distractor caused the saccade endpoint and saccade trajectory to deviate towards the distractor whereas the remote bimodal distractor caused a deviation away from the distractor. Furthermore, saccade averaging and trajectory deviation evoked by a bimodal distractor was larger compared to the effects evoked by a unimodal distractor. This indicates that a bimodal distractor evoked stronger spatial oculomotor competition compared to a unimodal distractor and that the direction of the interference depended on the distance between the target and the distractor. Together, these findings suggest that the oculomotor vector to irrelevant bimodal input is enhanced and that the interference by multisensory input is stronger compared to unisensory input.
当执行向目标位置的眼动时，无关干扰刺激的存在会影响扫视的指标和潜伏期。本研究调查了不同感觉模态（即听觉、视觉和视听）的干扰物在距视觉目标不同距离（即近或远）呈现时的影响。双峰干扰物的干扰效应在空间域比在时间域更明显。结果表明，干扰方向取决于视觉场景的空间布局。近距离双峰干扰物使扫视终点和扫视轨迹向干扰物方向偏离，而远距离双峰干扰物则使扫视轨迹向远离干扰物的方向偏离。此外，与单峰干扰物引起的效应相比，双峰干扰物引起的扫视平均化和轨迹偏离更大。这表明，与单峰干扰物相比，双峰干扰物引发了更强的空间眼动竞争，且干扰方向取决于目标与干扰物之间的距离。总之，这些发现表明，指向无关双峰输入的眼动向量增强，且多感觉输入的干扰比单感觉输入更强。
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