Processing Phenomena and the Dissociation Between Subjective and Objective Workload Measures (Cognition, Automaticity, Verbal Reports)
Vidulich, Michael Anthony
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https://hdl.handle.net/2142/69643
Description
Title
Processing Phenomena and the Dissociation Between Subjective and Objective Workload Measures (Cognition, Automaticity, Verbal Reports)
Author(s)
Vidulich, Michael Anthony
Issue Date
1983
Department of Study
Psychology
Discipline
Psychology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Psychology, Experimental
Abstract
Causes of dissociation between subjective workload assessments and objective performance were investigated. A Sternberg memory search task was utilized. Sternberg task configurations varied in the automaticity of performance, stimulus presentation rate, discernability of stimuli, and the value of good performance. Automaticity in Sternberg task performance was manipulated by using two independent sets of stimuli; one of which was consistently mapped (i.e., targets were always the same) while the other was inconsistently mapped (i.e., targets changed over trials). Also, all Sternberg configurations were performed both as single tasks and as part of dual task combinations (with a manual control task). During testing subjects rated all trials on eight typical bipolar rating scales. Analysis of the results detected several differences (i.e., dissociations) between what the ratings of workload would predict and the actual performance that occurred. Most notably, the workload scales tended to underestimate the advantage of consistent Sternberg-task mapping in dual task environment and misrepresented the effects of the presentation rate and motivation manipulations. The results were interpreted as supporting cognitive-processing-based experimentation over task-characteristic research in subjective workload assessment.
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