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ReferencesNavigation arrowAuthorsNavigation arrowRobert E. Schlegel

Publication statistics

Pub. period:1987-1994
Pub. count:5
Number of co-authors:6



Co-authors

Number of publications with 3 favourite co-authors:

Kirby Gilliland:2
Betina Schlegel:2
Ioannis Vasmatzidis:1

 

 

Productive colleagues

Robert E. Schlegel's 3 most productive colleagues in number of publications:

Kirby Gilliland:4
Jerry L. Purswell:3
Betina Schlegel:2
 
 
 
Jun 18

“ Computer programs emerge as the outcome of complex human processes of cognition, communication and negotiation, which serve to establish the meaningful embedding of the computer system in its intended use context. ”

-- Floyd, 1992, p. 24

 
 

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Robert E. Schlegel

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Publications by Robert E. Schlegel (bibliography)

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1994
 
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Vasmatzidis, Ioannis and Schlegel, Robert E. (1994): A Methodology for Investigating Heat Stress Selectivity Effects on Mental Performance. In: Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting 1994. pp. 510-514.

“This paper outlines a methodology that can be used to investigate the selectivity patterns of heat stress effects. The adopted view is that heat stress causes performance to deteriorate because it depletes attentional resources. The term "selectivity" refers to the extent to which certain individual resource pools (the existence of which is postulated by multiple resource theories) are more susceptible to heat stress effects than others. The methodology consists of plotting performance of two time-shared tasks over time on the Performance Operating Characteristic (POC) space. Manipulating the difficulties of the paired tasks under the same environmental conditions (i.e., temperature level and exposure duration) produces a predictable change of the POC path. In particular, if the heat stress effects are non-selective, the POC path will rotate either clockwise or counter-clockwise depending on the task whose difficulty is increased. On the contrary, if the heat stress effects are selective, increasing the difficulty of a task will have no effect on the orientation of the POC path.”

© All rights reserved Vasmatzidis and Schlegel and/or Human Factors Society

1993
 
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Shehab, Randa L. and Schlegel, Robert E. (1993): A Test of Fitts' Law in a Dual-Task Paradigm. In: Proceedings of the Human Factors and Ergonomics Society 37th Annual Meeting 1993. pp. 559-563.

“A simulated automobile driving environment was used to assess the validity of Fitts' Law under dual-task conditions. An aimed hand movement task was used as the Fitts task representative of reaching for controls on an instrument panel. The task required activation of one of four touch-sensitive response plates upon recognition of an auditory stimulus. Movement difficulty was manipulated by varying target location and size. Target location was examined at four levels corresponding to position in a 2 x 2 array. Distances of the targets from the two-o'clock position on the steering wheel ranged from 27 cm to 53 cm. The target plates were square and measured 1.27 cm (1/2 inch) or 0.64 cm (1/4 inch) along the side. The eight combinations of movement amplitude and target size yielded seven unique levels of Fitts' Index of Difficulty (ID) ranging from 5.4 to 7.4. The movement task was performed alone and in combination with two other tasks to create three levels of task loading. A display monitoring task was used to represent the visual demands of driving while an unstable tracking task was used to represent the perceptual-motor demands of driving. Following adequate training, ten subjects performed three replications of six task conditions (three loading levels x two target sizes). Within each replication, the order of testing was counterbalanced across subjects. The dual-task visual loading condition involving the movement and monitoring tasks consistently resulted in the longest reaction times. The dual-task perceptual-motor loading condition involving the movement and tracking tasks resulted in consistently longer movement times. Fitts' ID had a significant effect on both reaction time and movement time for all three conditions of task loading. However, separate linear regressions of movement time on ID for each task loading level resulted in R{squared} values of 0.66 to 0.82. Multiple linear regressions involving target size and movement amplitude as predictor variables provided better predictions with R{squared} values of 0.90 to 0.93. The regression equations provided in this paper may be used by designers to estimate differences in response time due to control size and location.”

© All rights reserved Shehab and Schlegel and/or Human Factors Society

1992
 
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Kweon, O'Seong, Schlegel, Robert E. and Purswell, Jerry L. (1992): Power Window Control Location Stereotypes. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 485-489.

“A paper-and-pencil survey instrument and an operational test were used to assess stereotype strength for automobile power window controls. Control panel layout (square vs. linear) and mounting plane were examined along with stereotype differences between subjects with technical backgrounds and those with non-technical backgrounds. A total of 273 participants ranging in age from 16 to 50 completed the survey instrument which requested responses to questions about which control was expected to activate a specified window. Subject preference for a particular control configuration was also solicited. A square control layout mounted on the instrument panel exhibited the strongest stereotype (94% of consistent responses for a single pattern) although it was the least preferred (22%). A square configuration mounted on the door panel possessed the second strongest stereotype (67% and 28% of consistent responses for the top two response patterns) and the highest preference (47%). A linear configuration mounted on the door panel exhibited a weaker stereotype (57% and 36% of consistent responses for the top two response patterns) and was preferred by 31% of the subjects. Preference tended to follow familiarity with controls in existing vehicles rather than ease of use or isomorphic arrangement. Twenty-four of the survey participants were also tested using actual power window controls mounted in a vehicle mockup. The subject's task involved moving the left hand as quickly as possible from the steering wheel to the subject's selected control upon presentation of a pictorial or verbal cue to raise or lower a specific window. Cue presentation and measurement of reaction time and movement time were provided by a PC. The square control layout mounted on the instrument panel was superior in terms of response time, stereotype strength and response consistency.”

© All rights reserved Kweon et al. and/or Human Factors Society

1988
 
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Schlegel, Betina, Schlegel, Robert E. and Gilliland, Kirby (1988): Gender Differences in Criterion Task Set Performance and Subjective Ratings. In: Proceedings of the Human Factors Society 32nd Annual Meeting 1988. pp. 848-852.

“This paper summarizes gender differences in performing various elements of the Criterion Task Set. Performance data and Subjective Workload Assessment Technique ratings were analyzed for 28 men and 28 women who participated in a large-scale CTS validation study. In general, women tended to perform slightly better than men on the majority of tasks. In particular, performance by women was better on Grammatical Reasoning, Linguistic Processing, Mathematical Processing, and Memory Search. Response times on Probability Monitoring were faster for women but at the expense of a greater number of False Alarms. Men performed better only on the high level of Continuous Recall and the medium level of Unstable tracking. Women tended to give lower subjective ratings than men to those tasks with a high memory component and gave higher ratings than men to those tasks involving input/output spatial elements.”

© All rights reserved Schlegel et al. and/or Human Factors Society

1987
 
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Schlegel, Robert E., Gilliland, Kirby and Schlegel, Betina (1987): Factor Structure of the Criterion Task Set. In: Proceedings of the Human Factors Society 31st Annual Meeting 1987. pp. 389-393.

“A large-scale experimental study was conducted involving the training and testing of 123 human subjects on the Criterion Task Set (Version 1.0). Testing was performed under baseline and stressor conditions. The performance data and Subjective Workload Assessment Technique ratings for the first baseline trial (Trail 6) were analyzed using the SAS VARCLUS procedure to evaluate the structure of the CTS. Seven clusters of response time variables were identified for the nine tasks. In general, the Memory Search, Linguistic Processing and Mathematical Processing tasks were grouped in one cluster with each of the other clusters representing a single task. Five clusters were identified for the SWAT ratings with clusters differentiated along the dimensions of task difficulty and processing stage.”

© All rights reserved Schlegel et al. and/or Human Factors Society

 
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Changes to this page (author)

26 Jun 2007: Modified
26 Jun 2007: Modified
26 Jun 2007: Modified
25 Jun 2007: Modified
25 Jun 2007: Added

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Page maintainer: The Editorial Team
URL: http://www.interaction-design.org/references/authors/robert_e__schlegel.html

Publication statistics

Pub. period:1987-1994
Pub. count:5
Number of co-authors:6



Co-authors

Number of publications with 3 favourite co-authors:

Kirby Gilliland:2
Betina Schlegel:2
Ioannis Vasmatzidis:1

 

 

Productive colleagues

Robert E. Schlegel's 3 most productive colleagues in number of publications:

Kirby Gilliland:4
Jerry L. Purswell:3
Betina Schlegel:2
 
 
 
Jun 18

“ Computer programs emerge as the outcome of complex human processes of cognition, communication and negotiation, which serve to establish the meaningful embedding of the computer system in its intended use context. ”

-- Floyd, 1992, p. 24

 
 

Featured chapter

Read the fascinating history of Wearable Computing, told by its father, Steve Mann

Read Steve's chapter !

 
 

Latest books

The Social Design of Technical Systems: Building technologies for communities
by Brian Whitworth and Adnan Ahmad

 
Start reading

The Encyclopedia of Human-Computer Interaction, 2nd Ed.
by Mads Soegaard and Rikke Friis Dam

 
Start reading
 
 

Help us help you!

 
 
 
 
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