Effect of letter spacing on visual span and reading speed
Effect of letter spacing on visual span and reading speed
复制标题
DOI：
10.1167/7.2.2
复制
发表时间：
2007-01-01
影响因子：
1.8
通讯作者：
Chung, Susana T. L.
中科院分区：
文献类型：
--
作者：
Yu, Deyue;Cheung, Sing-Hang;Chung, Susana T. L.
S. T. L. Chung (2002) 表明，快速串行视觉呈现 (RSVP) 阅读速度随字母间距的变化而变化，在文本的标准字母间距附近达到峰值，并且对于较小和较大的间距都会降低。在这项研究中，我们测试了这样一个假设：阅读速度对字母间距的依赖性是由视觉跨度的大小介导的，即在不移动眼睛的情况下高精度识别的字母数量。如果是这样，视觉跨度的大小和阅读速度应该表现出与字母间距类似的依赖性。我们测试了 RSVP 阅读的这一预测，并询问它是否可以推广到需要眼球运动的文本块的阅读。我们测量了视觉跨度曲线和阅读速度与字母间距的函数关系。视觉跨度曲线是用三元组（三个随机字母组成的字符串）测量的，是字母识别准确度与注视点左侧或右侧字母位置的函数关系图。视觉跨度的大小通过测量视觉跨度 pro 下的面积来量化。勒。阅读性能使用两种演示方法进行测量：RSVP 和抽认卡（四行短文本块）。我们发现，两种演示方法测量的视觉跨度的大小和阅读速度显示出对字母间距的定性相似的依赖关系，并且它们高度相关。这些结果与视觉跨度的大小是限制阅读速度的主要视觉因素的观点是一致的。关键词：视觉广度、阅读速度、字母间距、视觉拥挤
S. T. L. Chung (2002) has shown that rapid serial visual presentation (RSVP) reading speed varies with letter spacing, peaking near the standard letter spacing for text and decreasing for both smaller and larger spacings. In this study, we tested the hypothesis that the dependence of reading speed on letter spacing is mediated by the size of the visual span-the number of letters recognized with high accuracy without moving the eyes. If so, the size of the visual span and reading speed should show a similar dependence on letter spacing. We tested this prediction for RSVP reading and asked whether it generalizes to the reading of blocks of text requiring eye movements. We measured visual-span profiles and reading speeds as a function of letter spacing. Visual-span profiles, measured with trigrams (strings of three random letters), are plots of letter-recognition accuracy as a function of letter position left or right of fixation. Size of the visual span was quantified by a measure of the area under the visual-span pro. le. Reading performance was measured using two presentation methods: RSVP and flashcard (a short block of text on four lines). We found that the size of the visual span and the reading speeds measured by the two presentation methods showed a qualitatively similar dependence on letter spacing and that they were highly correlated. These results are consistent with the view that the size of the visual span is a primary visual factor that limits reading speed. Keywords: visual span, reading speed, letter spacing, visual crowding