With the aim of improving information retrieval system design, this study explored the effect of cognitive load on the propensity to reformulate queries during information seeking on the Web, specifically the effect of manipulating three affective components that contribute to cognitive load--mental demand, temporal demand, and frustration A significant difference in the propensity of query reformulation behavior was found between searchers exposed to cognitive load manipulations and searchers who were not exposed. Those exposed to cognitive load manipulations, namely, mental demand, temporal demand, and frustration, made 2.18 times fewer search queries than searchers not exposed. Furthermore, the NASA-TLX cognitive load scores of searchers who were exposed to the three cognitive load manipulations were higher than those of searchers who were not exposed. However, the propensity of query reformulation behavior did not differ across task types. The findings suggest that a dual-task method and NASA-TLX assessment serve as good indicators of cognitive load. Because the findings show that cognitive load hinders a searcher's interaction with information search tools, this study concludes by recommending strategies for reducing cognitive load when designing information systems, or user interfaces. / A Dissertation submitted to the School of Library and Information Studies in partial fulfillment of the requirements for the degree of Doctor of
Philosophy. / Summer Semester, 2012. / April 3, 2012. / Cognitive load, Cognitive load manipulation, Information retrieval, Mental workload, NASA-TLX, Query reformulation / Includes bibliographical references. / Kathleen Burnett, Professor Directing Dissertation; Neil Charness, University Representative; Gary Burnett, Committee Member; Besiki Stvilia, Committee Member.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_183033 |
| Contributors | Na, Kyoungsik (authoraut), Burnett, Kathleen (professor directing dissertation), Charness, Neil (university representative), Burnett, Gary (committee member), Stvilia, Besiki (committee member), School of Library and Information Studies (degree granting department), Florida State University (degree granting institution) |
| Publisher | Florida State University, Florida State University |
| Source Sets | Florida State University |
| Language | English, English |
| Detected Language | English |
| Type | Text, text |
| Format | 1 online resource, computer, application/pdf |
| Rights | This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). The copyright in theses and dissertations completed at Florida State University is held by the students who author them. |
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