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Andrea H. Mason

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Publications by Andrea H. Mason (bibliography)

» 2007 «

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Mason, Andrea H. (2007): An experimental study on the role of graphical information about hand movement when interacting with objects in virtual reality environments. In Interacting with Computers, 19 (3) pp. 370-381

“In this series of experiments, we investigated whether a crude representation of the hand that was extinguished at movement onset improved performance when compared to a no-feedback situation. Subjects performed simple reach to grasp movements in a virtual environment in two experiments. In Experiment 1, trials were blocked so that subjects were aware that a graphical representation of the hand would either be available throughout the movement (FA), be removed at movement onset (FAB), or not be available (NF). In Experiment 2, trials were randomized so that subjects were unaware of whether feedback would be available throughout the trial or removed at movement onset. Our results indicated that when subjects were aware of the availability of graphical feedback, the FAB condition improved performance compared to the NF condition. Furthermore, movement time was similar in the two feedback available conditions (FA, FAB). In contrast, for the randomized trial presentation, the positive influence of the FAB condition was diminished. These results suggest that visual feedback available prior to movement onset can be used to calibrate the proprioceptive system and improve performance over a no feedback situation. These results can be applied by designers of virtual environments to solve problems related to occlusion of important environmental information by the hand as users reach to grasp and manipulate objects.”

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» 2004 «

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Mason, Andrea H. and MacKenzie, Christine L. (2004): The Role of Graphical Feedback About Self-Movement when Receiving Objects in an Augmented Environment. In Presence: Teleoperators and Virtual Environments, 13 (5) pp. 507-519

» 2002 «

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Mason, Andrea H. and MacKenzie, Christine L. (2002): The Effects of Visual Information about Self-Movement on Grasp Forces When Receiving Objects in an Augmented Environment. In: HAPTICS 2002 - Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems 2002 2002. pp. 105-112. Available online

» 2001 «

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Mason, Andrea H., Walji, Masuma A., Lee, Elaine J. and MacKenzie, Christine L. (2001): Reaching Movements to Augmented and Graphic Objects in Virtual Environments. In: Beaudouin-Lafon, Michel and Jacob, Robert J. K. (eds.) Proceedings of the ACM CHI 2001 Human Factors in Computing Systems Conference March 31 - April 5, 2001, Seattle, Washington, USA. pp. 426-433. Available online

“This work explores how the availability of visual and haptic feedback affects and kinematics of reaching performance in a tabletop virtual environment. Eight subjects performed reach-to-grasp movements toward target objects of various sites in conditions where visual and haptic feedback were either present or absent. It was found that movement time was slower when visual feedback of the moving limb was not available. Further MT varied systematically with target size when haptic feedback was available (i.e. augmented targets), and thus followed Fitts' law. However, movement times were constant regardless of target size when haptic feedback was removed. In depth analysis of the reaching kinematics revealed that subjects spent longer decelerating toward smaller targets in conditions where haptic feedback was available. In contrast, deceleration time was constant when haptic feedback was absent. These results suggest that visual feedback about the moving limb and veridical haptic feedback about object contract are extremely important for humans to effectively work in virtual environments.”

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