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]

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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 Presentation

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Page 1: Model-based Highlighting to Support Selective Reading on the Web

Model-based Highlighting to Support Selective Reading on

the Web

Ion [email protected]

Page 2: Model-based Highlighting to Support Selective Reading on the Web

About... ... me Information Science @ UU.NL

Page 3: Model-based Highlighting to Support Selective Reading on the Web

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

Page 4: Model-based Highlighting to Support Selective Reading on the Web

Contents Introduction Study “Individual differences” Cognitive model Study “Voice suggestions” Study “Graphical suggestions” Study “VIP” Conclusion and discussion

Page 5: Model-based Highlighting to Support Selective Reading on the Web

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

Page 6: Model-based Highlighting to Support Selective Reading on the Web

Study “Individual differences” Objective:

Identify determinants of performance and satisfaction in web-assisted tasks

Page 7: Model-based Highlighting to Support Selective Reading on the Web

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.

Page 8: Model-based Highlighting to Support Selective Reading on the Web

Tasks

Page 9: Model-based Highlighting to Support Selective Reading on the Web

Hypothetical factors Domain expertise Working memory capacity Episodic memory Cognitive style Spatial ability Age Gender

Page 10: Model-based Highlighting to Support Selective Reading on the Web

Navigation metrics

Page 11: Model-based Highlighting to Support Selective Reading on the Web

Results

Page 12: Model-based Highlighting to Support Selective Reading on the Web

Results (cont’d)

Page 13: Model-based Highlighting to Support Selective Reading on the Web

Results (cont’d)

Page 14: Model-based Highlighting to Support Selective Reading on the Web

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

Page 15: Model-based Highlighting to Support Selective Reading on the Web

CoLiDeS+

Page 16: Model-based Highlighting to Support Selective Reading on the Web

Models vs. data

Page 17: Model-based Highlighting to Support Selective Reading on the Web

Study “Voice suggestions”

Page 18: Model-based Highlighting to Support Selective Reading on the Web

Study “Graphical suggestions”

Page 19: Model-based Highlighting to Support Selective Reading on the Web

Study “Graphical suggestions” (cont’d)

Page 20: Model-based Highlighting to Support Selective Reading on the Web

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

Page 21: Model-based Highlighting to Support Selective Reading on the Web

Conclusions Support for selective reading is:

Needed Possible Not easy

Empirical research and cognitive modeling could help

Page 22: Model-based Highlighting to Support Selective Reading on the Web

Discussion points Ecological validity vs. accuracy ? Scalability of cognitive models ? Ontologies vs. semantic spaces ? Goals known in advance ? Static goal representations ?