Parks Nathan A, Hilimire Matthew R, Corballis Paul M
Department of Psychology, Georgia Institute of Technology, Atlanta, Georgia, USA.
Psychophysiology. 2009 May;46(3):498-501. doi: 10.1111/j.1469-8986.2009.00801.x.
The postauricular reflex (PAR) is a vestigial microreflex evoked by an abrupt auditory onset. Previous studies have indicated that the PAR is unaffected by auditory selective attention. Here, we report that the PAR can be modulated by a crossmodal manipulation of attentional demands within the visual modality. Subjects (N=17) performed a central rapid serial visual presentation (RSVP) task while presented with irrelevant auditory distractor probes that elicited the PAR. Visual attentional demands were manipulated by altering the perceptual load of the RSVP task. The PAR modulated systematically with perceptual load, decreasing in amplitude with increased perceptual load. Results indicate that the PAR can be influenced by attention, at least within the visual modality.
耳后反射（PAR）是一种由突发听觉起始诱发的残留微反射。先前的研究表明，PAR不受听觉选择性注意的影响。在此，我们报告PAR可通过视觉模态内注意力需求的跨模态操作进行调节。受试者（N = 17）在执行中央快速序列视觉呈现（RSVP）任务时，会同时呈现引发PAR的无关听觉干扰探针。通过改变RSVP任务的感知负荷来操纵视觉注意力需求。PAR随感知负荷系统地调节，其幅度随着感知负荷的增加而减小。结果表明，至少在视觉模态内，PAR会受到注意力的影响。
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