05 attention

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05 attention

  1. 1. The DesignHCI human Process factor
  2. 2. starwars.wikia.com
  3. 3. Memory• Long term memory: Learning• Short term memory• Working memory
  4. 4. AttentionUnderstanding attention processes Note to self see - http://www.useit.com/alertbox/tunnel-vision.html What is attention?
  5. 5. AttentionUnderstanding attention processes Why is attention relevant to interface design?
  6. 6. Spotlight metaphor What makes the spotlight move?Visualogist on flickr
  7. 7. Attention ControlTop-down Bottom-up
  8. 8. Attention ControlTop-down Driven by: Expectation Intention Bottom-up
  9. 9. Attention ControlTop-down Captured by: Salience Newness Facilitated by: Person’s Bottom-up attentional set
  10. 10. vVisual Scanning s Visual Search
  11. 11. vVisual Scanning s Visual Search
  12. 12. Visual ScanningInfluenced by6 factors: 1 Habit 2 Attention capture 3 Info content: Event rate 4 Info content: Contextual relevance 5 Information value 6 Effort conservation
  13. 13. Visual ScanningProbability of looking at an area: Salience Effort Expectancy Value
  14. 14. vVisual Scanning s Visual Search
  15. 15. Visual SearchThe effort to detect a target itemwhose presence or position inthe field is not known a priori.
  16. 16. TargetWell-specified Vague Top-down Bottom-up
  17. 17. FieldStructured Predictable Haphazard In which type of field is it easier to find a target?
  18. 18. Facilitating Visual SearchHow can we design interfacesso it’s easier for people to find what they need?
  19. 19. A target is easier to find if… It is salient. It is novel or unfamiliar among familiar items. It possesses a unique feature rather than lacking it.* It (not the distractors) deviates from a default value.* Only one target needs to be sought at a time.
  20. 20. Presence/Absence of Unique Feature
  21. 21. Deviation from default value| | | | | | | | | | | | || | | | | | | | | | |
  22. 22. Summary Attentional Control  Top-down vs. Bottom-up Visual Scanning  6 factors that influence it Visual Search  Target  Field  Facilitating it Amazon.com

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