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Ka, Hyun (2013) CIRCLING INTERFACE: AN ALTERNATIVE INTERACTION METHOD FOR ON-SCREEN OBJECT MANIPULATION. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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An alternative interaction method, called the circling interface, was developed and evaluated for individuals with disabilities who find it difficult or impossible to consistently and efficiently perform pointing operations involving the left and right mouse buttons. The circling interface is a gesture-based interaction technique. To specify a target of interest, the user makes a circling motion around the target. To specify a desired pointing command with the circling interface, each edge of the screen is used. The user selects a command before circling the target. Empirical evaluations were conducted with human subjects from three different groups (individuals without disability, individuals with spinal cord injury, and individuals with cerebral palsy), comparing each group's performance on pointing tasks with the circling interface to performance on the same tasks when using a mouse button or dwell-clicking software. Across all three groups, the circling interface was faster than the dwelling interface (although the difference was not statistically significant). For the single-click operation, the circling interface was slower than dwell selection, but for both double-click and drag-and-drop operations, the circling interface was faster. In terms of performance accuracy, the results were mixed: for able-bodied subjects circling was more accurate than dwelling, for subjects with SCI dwelling was more accurate than circling, and for subjects with CP there was no difference. However, if errors caused by circling on an area with no target or by ignoring circles that are too small or too fast were automatically corrected by the circling interface, the performance accuracy of the circling interface would significantly outperform dwell selection. This suggests that the circling interface can be used in conjunction with existing pointing techniques and this combined approach may provide more effective mouse use for people with pointing problems. Consequently, the circling interface can improve clinical practice by providing an alternative pointing method that does not require physically activating mouse buttons and is more efficient than dwell-clicking. It is also expected to be useful for both computer access and augmentative communication software.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Ka, Hyunhyk21@pitt.eduHYK21
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairSimpson, Richardris20@pitt.eduRIS20
Committee MemberKoontz, Alicia Makoontz@pitt.eduAKOONTZ
Committee MemberBaker, Nancy Anab36@pitt.eduNAB36
Committee MemberLoPresti, Edmund
Date: 12 September 2013
Date Type: Publication
Defense Date: 17 July 2013
Approval Date: 12 September 2013
Submission Date: 10 July 2013
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 154
Institution: University of Pittsburgh
Schools and Programs: School of Health and Rehabilitation Sciences > Rehabilitation Science and Technology
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: circling interface, assistive technology, computer access, alternative interaction method, gesture recognition, human computer interaction, HCI
Date Deposited: 12 Sep 2013 15:04
Last Modified: 15 Nov 2016 14:14


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