CHI '86 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Measuring the true cost of command selection: techniques and results
CHI '90 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Toolglass and magic lenses: the see-through interface
SIGGRAPH '93 Proceedings of the 20th annual conference on Computer graphics and interactive techniques
Two-handed input in a compound task
CHI '94 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Passive real-world interface props for neurosurgical visualization
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Two-handed virtual manipulation
ACM Transactions on Computer-Human Interaction (TOCHI)
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GI '05 Proceedings of Graphics Interface 2005
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One of the recent trends in computer input is to utilize users' natural bimanual motor skills. This article further explores the potential benefits of such two-handed input. We have observed that bimanual manipulation may bring two types of advantages to human-computer interaction: manual and cognitive. Manual benefits come from increased time-motion efficiency, due to the twice as many degrees of freedom simultaneously available to the user. Cognitive benefits arise as a result of reducing the load of mentally composing and visualizing the task at an unnaturally low level which is imposed by traditional unimanual techniques. Area sweeping was selected as our experimental task. It is representative of what one encounters, for example, when sweeping out the bounding box surrounding a set of objects in a graphics program. Such tasks cannot be modeled by Fitts' Law alone and have not been previously studied in the literature. In our experiments, two bimanual techniques were compared with the conventional one-handed GUI approach. Both bimanual techniques employed the two-handed “stretchy” technique first demonstrated by Krueger in 1983. We also incorporated the “Toolglass” technique introduced by Bier et al. in 1993. Overall, the bimanual techniques resulted in significantly faster performance than the status quo one-handed technique, and these benefits increased with the difficulty of mentally visualizing the task, supporting our bimanual cognitive advantage hypothesis. There was no significant difference between the two bimanual techniques. This study makes two types of contributions to the literature. First, practically we studied yet another class of transaction where significant benefits can be realized by applying bimanual techniques. Furthermore, we have done so using easily available commercial hardware in the context to our understanding of why bimanual interaction techniques have an advantage over unimanual techniques. A literature review on two-handed computer input and some of the relevant bimanual human mototr control studies is also included.