model-based highlighting to support selective reading on the web
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Model-based Highlighting to Support Selective Reading on the Web. Ion Juvina [email protected]. About.... ... me Information Science @ UU.NL. Aknowledgements. Herre van Oostendorp Eelco Herder Ellert van den Broek Vincent van der Linden Koen Buurman Poyan Karbor Brian Pauw - PowerPoint PPT PresentationTRANSCRIPT
About... ... me Information Science @ UU.NL
Aknowledgements Herre van Oostendorp Eelco Herder Ellert van den Broek Vincent van der Linden Koen Buurman Poyan Karbor Brian Pauw Arnaud Lek Martijn Abbing Richard van Yperen
Contents Introduction Study “Individual differences” Cognitive model Study “Voice suggestions” Study “Graphical suggestions” Study “VIP” Conclusion and discussion
Introduction Navigation is a major part of user
experience on the web (Lazar, 2003) Web interfaces
Structure vs. content Revisits
Post valued recall Case: using the web by visually impaired
persons (VIP) via screen readers
Study “Individual differences” Objective:
Identify determinants of performance and satisfaction in web-assisted tasks
Activities Morrison, Pirolli and Card (2001)
Types of activities users perform on the Web.
2188 usable responses. Example:
I accessed Netscape's financial site to check mycredit card balance and how long it would take topay it off. I'm now MUCH more fiscally aware of myspending habits and am trying to pay off my balancemore actively.
Tasks
Hypothetical factors Domain expertise Working memory capacity Episodic memory Cognitive style Spatial ability Age Gender
Navigation metrics
Results
Results (cont’d)
Results (cont’d)
Cognitive models SNIF-ACT CoLiDeS MESA Value and limitations:
Information scent Common Too narrowly defined
Semantics prevail over syntax Static background knowledge Common user prevails over individual
differences
CoLiDeS+
Models vs. data
Study “Voice suggestions”
Study “Graphical suggestions”
Study “Graphical suggestions” (cont’d)
Study “VIP” Manipulation
Screen switched off Highlighting by increasing reading priority Suggestions generated on-the-fly
No look ahead Results:
Common mechanism Spatial ability – task performance
Weak suggestion mechanism Position: 5 -> 4 Breaks of coherence
Conclusions Support for selective reading is:
Needed Possible Not easy
Empirical research and cognitive modeling could help
Discussion points Ecological validity vs. accuracy ? Scalability of cognitive models ? Ontologies vs. semantic spaces ? Goals known in advance ? Static goal representations ?