NDLI: Target Expansion Lens: It is Not the More Visual Feedback the Better!

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Target Expansion Lens: It is Not the More Visual Feedback the Better!

Content Provider	ACM Digital Library
Author	Guillon, Maxime Nigay, Laurence Leitner, François
Abstract	To enhance pointing tasks, target expansion techniques allocate larger activation areas to targets. We distinguish two basic elements of a target expansion technique: the expansion algorithm and the visual aid on the effective expanded targets. We present a systematic analysis of the relevance of the visual aid provided by (1) existing target expansion techniques and (2) Expansion Lens. The latter is a new continuous technique for acquiring targets. Expansion Lens namely, uses a round area centered on the cursor: the lens. The users can see in the lens the target expanded area boundaries that the lens is hovering over. Expansion Lens serves as a magic lens revealing the underlying expansion algorithm. The design rationale of Expansion Lens is based on a systematic analysis of the relevance of the visual aid according to the three goal-oriented phases of a pointing task namely the starting, transfer and validation phases. Expansion Lens optimizes (1) the transfer phase by providing a simple-shaped visual aid centered on the cursor, and (2) the validation phase regarding error rates, by displaying the target expanded area boundaries. The results of our controlled experiment comparing Expansion Lens with four existing target expansion techniques show that Expansion Lens highlights a good trade-off for performance by being the less-error prone technique and the second fastest technique. The experimental data for each phase of the pointing task also confirm our design approach based on the relevance of the visual aid according to the phase of the pointing task.
Starting Page	52
Ending Page	59
Page Count	8
File Format	PDF
ISBN	9781450341318
DOI	10.1145/2909132.2909265
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2016-06-07
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Pointing Target expansion Visual aid
Content Type	Text
Resource Type	Article

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