Grasp Interaction with Tablets by Katrin Wolf

Author:Katrin Wolf
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

5.4.3.2 Front-of-Device Interaction Areas

The results presented here confirm the findings of Odell and Chandrasekaran that the center of tablet touchscreens is not accessible with grasping hands. Moreover, the presented results show that the limit of reachability is defined by the digits’ length. For positions very close to the vertical edges, our findings are different from those of Odell and Chandrasekaran. They present interaction areas that extend the touchscreen of a tablet and state that the bezel is also accessible through direct touch. However, the heatmaps (Fig. 5.7) showed that some participants touched the vertical bezel; statistical analysis indicated that a minimum distance of 2.8 cm was in average the closest distance from the device edge that could be touched. Assuming, that the palm was not moved a lot, one could assume the digits were bent a lot for reaching very close positions and stretched for accessing point far away. The hard accessibility of very outer target can be explained through findings of Trudeau et al. (2012). They found for one-handed phone interaction that the thumb performs best when its pose is relaxed, neither strongly bent nor completely stretched.

The results presented here show that areas are accessible that are located between points near the bezel (that require the joints to be much flexed) and points that are a bit less away than a digit’s length (to reach these points a digit has to be stretched). However, according to Trudeau et al., the minimum and maximum of the accessible area may lack in usability and an ergonomic optimal distance for touch interaction is located in between both extreme values.

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