Freehand interaction with large displays: Effects of body posture, interaction distance and target size on task performance, perceived usability and workload

2021 ◽  
Vol 93 ◽  
pp. 103370
Author(s):  
Da Tao ◽  
Xiaofeng Diao ◽  
Tieyan Wang ◽  
Jingya Guo ◽  
Xingda Qu
Keyword(s):  
Task Performance ◽  
Body Posture ◽  
Target Size ◽  
Large Displays ◽  
Interaction Distance ◽  
Perceived Usability

scholarly journals Viewpoint Usability for Desktop Augmented Reality

2006 ◽  
Vol 5 (3) ◽  
pp. 33-39 ◽  
Author(s):  
Seokhee Jeon ◽  
Hyeongseop Shim ◽  
Gerard J. Kim
Keyword(s):  
Augmented Reality ◽  
Task Performance ◽  
Depth Perception ◽  
Object Manipulation ◽  
Head Mounted Display ◽  
Usability Problems ◽  
Head Mounted Displays ◽  
Hand Eye Coordination ◽  
Manipulation Task ◽  
Perceived Usability

In this paper, we have investigated the comparative usability among three different viewing configurations of augmented reality (AR) system that uses a desktop monitor instead of a head mounted display. In many cases, due to operational or cost reasons, the use of head mounted displays may not be viable. Such a configuration is bound to cause usability problems because of the mismatch in the user's proprioception, scale, hand eye coordination, and the reduced 3D depth perception. We asked a pool of subjects to carry out an object manipulation task in three different desktop AR set ups. We measured the subject's task performance and surveyed for the perceived usability and preference. Our results indicated that placing a fixed camera in the back of the user was the best option for convenience and attaching a camera on the user�s head for task performance. The results should provide a valuable guide for designing desktop augmented reality systems without head mounted displays

Older Adults Demonstrate Reduced Performance in a Fitts’ Task Involving Cervical Spine Movement

2007 ◽  
Vol 24 (4) ◽  
pp. 352-363 ◽  
Author(s):  
Steven R. Passmore ◽  
Jeanmarie Burke ◽  
Jim Lyons
Keyword(s):  
Cervical Spine ◽  
Task Performance ◽  
Motion Capture ◽  
Movement Time ◽  
Target Size ◽  
Old Adults ◽  
Central Processing ◽  
Age Related ◽  
Age Range ◽  
Spine Movement

A discrete aiming head movement task was developed to replicate Fitts’ movement paradigm. Movement time (MT) differences between young (age range 24-29 years, n = 8) and old adults (age range 75-85 years, n = 8) were examined. Cervical spine (CS) range of motion (ROM) was recorded. A head mounted motion capture device was used to evaluate task performance. Three amplitudes and three target widths generated nine indexes of difficulty (IDs). Global ROM was decreased in old adults. The ID and MT relationship was maintained with age; however, old adults were slower, more variable, and more affected by ID. Variations in target size were used as the accuracy variable for both groups. As target size increased, the old population overshot their endpoint. These data support the hypothesis that, besides musculoskeletal slowing with age, there may be age-related deterioration of central processing, planning, or perception mechanisms.

Towards Intelligent Window Layout Management

2015 ◽  
pp. 146-161
Author(s):  
Rui Chen ◽  
Tao Lin ◽  
Tiantian Xie
Keyword(s):  
Task Performance ◽  
Screen Size ◽  
Large Displays ◽  
Window Management ◽  
Mental Map ◽  
High Level ◽  
Screen Space ◽  
The Cost ◽  
Great Burden ◽  
Conflicting Goals

Large displays are becoming increasingly pervasive. Larger screen size provides an opportunity for users to see more information simultaneously, but at the cost of managing a larger amount of screen space, which is a great burden declining task performance and user experience. User would do/feel better if this burden could be takeover by the computer itself employing techniques that automate the management of screen space. Some studies on automatic window management have been carried out with some success. However, they mainly focus on utilization of empty screen space and/or overlap elimination while ignore preservation of the mental map of users, which tends to cause user confusion and disorientation in practical use. In this chapter, an empirical model is proposed to identifying the degree of mental map preservation for a window layout rearrangement. Furthermore, a method combining high-level window importance with a genetic multi-objective optimization algorithm is presented to generate recommended window layouts featuring a tradeoff among several conflicting goals: (1) better usage of screen space, (2) lower degree of window overlaps, and (3) better mental map preservation. Results suggest that the method is capable of generating suitable window layouts for users and takes a key step toward developing an automated windows manager.

scholarly journals The Semantic Meaning of Hand Shapes and Z-Dimension Movements of Freehand Distal Pointing on Large Displays

Symmetry ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 329
Author(s):  
Chien-Hsiung Chen ◽  
Jian-Li Wang
Keyword(s):  
Index Finger ◽  
Design Guidelines ◽  
Semantic Meaning ◽  
Large Displays ◽  
Interaction Distance ◽  
Large Display ◽  
Small Targets ◽  
The Relationship ◽  
Selection Of ◽  
Sinusoidal Function

It is difficult to select small targets in freehand distal pointing on large displays due to physical fatigue and jitter. Previous research proposed many solutions but not through the semantic meaning of hand behaviors. The purpose of this study is to investigate the hand behaviors, including hand shapes and motions in the Z-dimension between small and large target selections, by means of two controlled experiments. The generated results indicated that the following: (1) when interacting with a large display from a remote distance, users preferred to complete a low-precision task by the whole hand while using the finger in high-precision tasks. As a result, users moved small targets by the index finger gesture while moving large targets by open hand gesture; (2) selection of small targets led to hand stretching which might reduce the interaction distance; (3) the orientation had significant effects on hand motions in the Z-dimension. The relationship between orientation and hand motions in the Z-dimension is similar to a sinusoidal function; (4) mouse-like pointing had much impact on freehand interaction. Based on these results, some design guidelines for freehand interaction and design suggestions for freehand pointing were discussed.

Intelligent Agent Transparency

2016 ◽  
Vol 60 (1) ◽  
pp. 1706-1710 ◽  
Author(s):  
Kimberly Stowers ◽  
Nicholas Kasdaglis ◽  
Olivia Newton ◽  
Shan Lakhmani ◽  
Ryan Wohleber ◽  
...  
Keyword(s):  
Focus Group ◽  
Task Performance ◽  
Situation Awareness ◽  
Experimental Testing ◽  
Intelligent Agent ◽  
Unmanned Vehicle ◽  
Operator Performance ◽  
Perceived Usability ◽  
Vehicle Management

We evaluated the usability and utility of an unmanned vehicle management interface that was developed based on the Situation awareness–based Agent Transparency model. We sought to examine the effect of increasing levels of agent transparency on operator task performance and perceived usability of the agent. Usability and utility were assessed through flash testing, a focus group, and experimental testing. While usability appeared to decrease with the portrayal of uncertainty, operator performance and reliance on key parts of the interface increased. Implications and next steps are discussed.

Some Recent Results in Quiescent Prominence Spectrometry

1979 ◽  
Vol 44 ◽  
pp. 41-47
Author(s):  
Donald A. Landman
Keyword(s):  
Real Time ◽  
Computer System ◽  
Spectral Response ◽  
Absolute Intensity ◽  
Solar Observatory ◽  
Target Size ◽  
Small Target ◽  
Signal Averaging ◽  
Quiescent Prominence

This paper describes some recent results of our quiescent prominence spectrometry program at the Mees Solar Observatory on Haleakala. The observations were made with the 25 cm coronagraph/coudé spectrograph system using a silicon vidicon detector. This detector consists of 500 contiguous channels covering approximately 6 or 80 Å, depending on the grating used. The instrument is interfaced to the Observatory’s PDP 11/45 computer system, and has the important advantages of wide spectral response, linearity and signal-averaging with real-time display. Its principal drawback is the relatively small target size. For the present work, the aperture was about 3″ × 5″. Absolute intensity calibrations were made by measuring quiet regions near sun center.

Effects of Concurrent Manual Task Performance on Connected Speech Acoustics in Individuals With Parkinson Disease

2019 ◽  
Vol 62 (7) ◽  
pp. 2099-2117 ◽  
Author(s):  
Jason A. Whitfield ◽  
Zoe Kriegel ◽  
Adam M. Fullenkamp ◽  
Daryush D. Mehta
Keyword(s):  
Task Performance ◽  
Speech Production ◽  
Dual Task ◽  
Motor Task ◽  
Task Condition ◽  
Connected Speech ◽  
Speech Acoustics ◽  
Single Task ◽  
Manual Task ◽  
Task Conditions

Purpose Prior investigations suggest that simultaneous performance of more than 1 motor-oriented task may exacerbate speech motor deficits in individuals with Parkinson disease (PD). The purpose of the current investigation was to examine the extent to which performing a low-demand manual task affected the connected speech in individuals with and without PD. Method Individuals with PD and neurologically healthy controls performed speech tasks (reading and extemporaneous speech tasks) and an oscillatory manual task (a counterclockwise circle-drawing task) in isolation (single-task condition) and concurrently (dual-task condition). Results Relative to speech task performance, no changes in speech acoustics were observed for either group when the low-demand motor task was performed with the concurrent reading tasks. Speakers with PD exhibited a significant decrease in pause duration between the single-task (speech only) and dual-task conditions for the extemporaneous speech task, whereas control participants did not exhibit changes in any speech production variable between the single- and dual-task conditions. Conclusions Overall, there were little to no changes in speech production when a low-demand oscillatory motor task was performed with concurrent reading. For the extemporaneous task, however, individuals with PD exhibited significant changes when the speech and manual tasks were performed concurrently, a pattern that was not observed for control speakers. Supplemental Material https://doi.org/10.23641/asha.8637008

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