The groovepad: ergonomic integration of isotonic and elastic input for efficient control of complementary subtasks

Authors:
Alexander Kulik;André Kunert;Anke Huckauf;Bernd Froehlich
Affiliations:
Bauhaus-Universität Weimar, Weimar, Germany;Bauhaus-Universität Weimar, Weimar, Germany;Universität Ulm, Ulm, Germany;Bauhaus-Universität Weimar, Weimar, Germany
Venue:
Proceedings of the 10th asia pacific conference on Computer human interaction
Year:
2012

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Abstract

The Groovepad is an input device that uses the physical frame of a regular touchpad as an elastic force sensor to permit additional rate-control input. The two independent input sensors can be used separately, but facilitate frequent and fluent switching between position-controlled and rate-controlled interaction techniques. We studied the usability of the Groovepad in pointing, panning, and dragging tasks. Our observations indicate that the use of the two input sensors for the same functionality (e.g.,cursor control) can result in a decision dilemma, which adversely affects performance. As an alternative, we propose to use both sensors for complementary subtasks. For example, we performed workspace panning with the elastic frame of the Groovepad, while cursor motion was operated with the touchpad. This particular mapping possesses the compelling property that the frame of the touchpad serves as a tactile reference of the visual workspace. A user study revealed that our approach was preferred and performed significantly better than techniques that only used touchpad input.