University of Leuven.
J Cogn Neurosci. 2014 May;26(5):1013-20. doi: 10.1162/jocn_a_00541. Epub 2013 Dec 17.
Changes in the sensory properties of numerosity stimuli have a direct effect on the outcomes of nonsymbolic number tasks. This suggests a prominent role of sensory properties in numerosity processing. However, the current consensus holds that numerosity is processed independent of its sensory properties. To investigate the role of sensory cues in ordinal number processes, we manipulated both dimensions orthogonally. Participants passively viewed the stimuli while their brain activity was measured using EEG. The results revealed an interaction between numerosity and its sensory properties in the absence of main effects. Different neural responses were present for trials where numerosity and sensory cues changed in the same direction compared with trials where they changed in opposite directions. These results show that the sensory cues are expected to change in concert with numerosity and support the notion that the visual cues are taken into account when judging numerosity.
数量刺激的感官属性变化会直接影响非符号数量任务的结果。这表明感官属性在数量处理中起着重要作用。然而，目前的共识认为数量是独立于其感官属性进行处理的。为了研究感官线索在顺序数量过程中的作用，我们正交地操纵了这两个维度。参与者在被动观看刺激的同时，使用 EEG 测量他们的大脑活动。结果表明，在没有主效应的情况下，数量和其感官属性之间存在相互作用。与数量和感官线索变化方向相反的试验相比，数量和感官线索变化方向相同的试验中存在不同的神经反应。这些结果表明，感官线索预计会与数量一起变化，并支持这样一种观点，即判断数量时会考虑到视觉线索。
