Binda Paola, Morrone M Concetta, Ross John, Burr David C
Department of Psychology, Università Vita-Salute San Raffaele, Via Olgettina 58, 20132, Milano, Italy.
Vision Res. 2011 Jan;51(1):34-42. doi: 10.1016/j.visres.2010.09.028. Epub 2010 Oct 8.
Saccadic eye movements produce transient distortions in both space and time. Mounting evidence suggests that space and time perception are linked, and associated with the perception of another important perceptual attribute, numerosity. Here we investigate the effect of saccades on the perceived numerosity of briefly presented arrays of visual elements. We report a systematic underestimation of numerosity for stimuli flashed just before or during saccades, of about 35% of the reference numerosity. The bias is observed only for relatively large arrays of visual elements, in line with the notion that a distinct perceptual mechanism is involved with enumeration of small numerosities in the 'subitizing' range. This study provides further evidence for the notion that space, time and number share common neural representations, all affected by saccades.
眼跳运动在空间和时间上都会产生短暂的扭曲。越来越多的证据表明，空间和时间感知是相互关联的，并且与另一个重要的感知属性——数量感知相关。在这里，我们研究眼跳对短暂呈现的视觉元素阵列的感知数量的影响。我们报告称，在眼跳之前或期间闪现的刺激，其数量会被系统性低估，约为参考数量的35%。这种偏差仅在相对较大的视觉元素阵列中观察到，这与一种观点相符，即一种独特的感知机制参与了“即时计数”范围内小数目的枚举。这项研究为空间、时间和数字共享共同神经表征这一观点提供了进一步的证据，它们都受眼跳的影响。
