國立清華大學資訊工程學系

Department of Computer Science

National Tsing Hua University

專題演講

SEMINAR

主講人：Prof. Sabarish Babu, Clemson University, USA

SPEAKER

題　目：Examining the Effects of Interaction Fidelity on Task Performance and Learning in Virtual Reality

TOPIC  

時  間： 105年12月29日(四) 2:20PM - 3:20PM

DATE　　

地　點： 台達館107室

PLACE

                         聯絡人：賴尚宏教授

Abstract: 

Virtual reality training applications are becoming more widespread as hardware costs for head-mounted displays (HMDs) and tracking technology decrease, enabling a wide variety of interaction techniques with diverse commercial input devices. Advancements in VR hardware yield higher levels of interaction fidelity or the objective degree of exactness with which real-world interactions can be reproduced in an interactive system. Despite the growing use of virtual reality simulations for training and education, few prior investigations have examined the constituent components of fidelity and how they affect performance and learning in the context of a real-world skills training applications. With tracking and HMD technology becoming affordable and reaching a wider audience, it is important to empirically evaluate the benefits and downsides associated with utilizing such technology. Using our scaffolded virtual metrology training simulation as a testbed for exploring issues related to interaction fidelity, we have created a bimanual interaction metaphor that allows users to select and manipulate objects with 6 degrees-of-freedom using both hands simultaneously. The simulation guides the user step-by-step in the process of taking precise measurements using calipers and micrometers. In an initial study, we examined the effects of simplifying interaction by constraining the number of degrees-of-freedom on measures including user performance, cognitive and psychomotor learning outcomes, presence, and perceived workload. Results indicate that the training application was beneficial in teaching basic metrology concepts and simplifying the interaction metaphor resulted in a detriment to the precision skills transfer from the VR simulation to the real world. Our second study examined the effects of presentation method including a HMD with co-located end-effectors compared to a large-screen immersive display with dislocated end-effectors on user performance and learning outcomes. In addition, physics fidelity was examined by either enabling or disabling gravity to determine usability improvements. Results indicate that the HMD condition was preferable to the immersive display in nearly all metrics while the no-gravity condition resulted in users adopting strategies that were not advantageous for task performance. Combined results from each study were used to create a set of general guidelines for user interface developers in highly immersive virtual environments.

Bio:

Sabarish “Sab” Babu is an Associate Professor in the Division of Human Centered Computing in the School of Computing at Clemson University in the USA. He received his BS, MS and PhD from the University of North Carolina at Charlotte, and completed a post-doctoral fellowship at the University of Iowa prior to joining Clemson University. His research interests are in the areas of virtual environments, applied perception in graphics and visualization, educational virtual reality, and 3D human computer interaction. He has authored or co-authored over 65 peer-reviewed publications in premiere venues sponsored by IEEE and ACM. He was the general chair of the IEEE International Conference on Virtual Reality (IEEE VR) 2016, the premiere international venue for VR research. He currently serves as a program chair for IEEE VR 2017. His research is sponsored by the US National Science Foundation, US Department of Labor, St. Francis and Medline Medical Foundations, and has received over US $1.5 million in external funding as a PI or Co-PI on several research projects related to virtual reality