On the readability and useful visual field of scrolling text

滚动文本是指文本在有限空间内从右向左滚动的媒体。我们探索了演示的属性，以便轻松阅读滚动文本。主要发现可以概括如下：1)我们在观察窗口中制作了文本卷轴。窗口的宽度从1到15个字符不等，观察者被要求调整滚动速度以舒适地阅读文本。随着窗口宽度增加到5个字符，最佳滚动速度迅速增加。然后，增加的速度逐渐降低，并几乎稳定到15个字符。街道上设备的滚动速度比现在的结果慢了两倍。2)我们操纵了字符数量(2，5和15)和滚动速度(基于初步实验，最优，比最优速度快两倍，慢两倍)。观察者被要求根据14个项目使用7分制来评估他们的印象。5个和15个字符数字的条件也给观察者留下了类似的印象。此外，在所有字符-数字条件下，较快的呈现被评估为“难以理解”，而较慢的呈现被评估为“令人讨厌”。3)我们短暂地呈现了一个平假名字符，该字符位于观察窗口的左上角、中下角或右下角。观察者被要求忽略或区分平假名字符，同时调整滚动速度以舒适地阅读文本。当平假名字符呈现在观看窗口的右上角上方或右下角时，滚动速度明显慢于在其他位置呈现平假名字符时。这表明当观察者正在阅读滚动文本时，有用的视野广泛地分布在观察窗口的右侧。

Scrolling text refers to the media in which text is scrolling from right to left in a limited space. We explored the properties of presentation to read scrolling text comfortably. The primary findings could be summarized as follows.1) We made a text scroll in a viewing window. The width of the window was varied from 1 to 15 characters, and observers were asked to adjust a scrolling rate to read the text comfortably. Optimal scrolling rate is increased rapidly with the increase of the window width up to 5 characters. Then the rate of increase gradually reduced and almost leveled off up to 15 characters. The scrolling rate of devices placed on the streets was found two times slower than the present results.2) We manipulated the number of characters (2,5,and 15) and scrolling rate (based on the preliminary experiments, optimal, two times faster and two times slower than the optimal rate). Observers were asked to evaluate their impressions according to 14 items by using a 7-point scale. The 5 and 15 characters-number conditions impressed the observers similarly. Moreover, in all characters-number conditions, faster presentations were evaluated as "hard to apprehend" and slower presentations as "irritating".3) We briefly presented a Hiragana character above or below the left, center, or right corner of the viewing window. Observers were asked to ignore or discriminate the Hiragana character, while adjusting scrolling rate to read the text comfortably. When the Hiragana character was presented above or below the right corner of the viewing window, scrolling rate was significantly slower than when the Hiragana character was presented at the other positions. This indicates that useful visual field is distributed widely on the right side of the viewing window when observers are reading a scrolling text.