Why Digital Displays Cannot Replace Paper by Hirohito Shibata & Kengo Omura

Author:Hirohito Shibata & Kengo Omura
Language: eng
Format: epub
ISBN: 9789811594762
Publisher: Springer Singapore

5.6.3.2 Impact on Reading and Writing Performance

When we handle a document with our hands, we tend to rotate it so we can handle it easily. Next, let’s see if the tilt of a document actually affects reading and writing performance.

In the first experiment, we asked participants to read documents at different document angles and examined how it influenced their reading speed and comprehension. The participants were 28 people in their twenties and thirties, all of whom were right-handed. The document angle was varied in seven increments: −30°, −10°, 0°, 5°, 10°, 20°, and 40°. We used 5° as the median value, because in our previous study, people preferred to rotate documents by 5° when reading them.

The results are shown in Fig. 5.34. The curve of reading speed was almost bilaterally symmetrical around the angle of 5° rotated to the left. The ideal document angle for right-handed people to read documents seemed to be 5°, as 5° was the only angle that had a significant difference compared to a 40° angle. However, no significant difference in reading speed was found for angles ranging from −10° to 20°, so we can say that this range of document angles is acceptable for reading. For reference, there was no significant difference in comprehension at any document angle.

Fig. 5.34The influence of document angle on reading performance

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