05 attention

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  • Salience - contrast – especially motion or color contrastNewness – abrupt onset, appearance of something new on the sceneAttentional set – if person is searching for it or is otherwise prepared to let it grab attention
  • If a channel has a high event rate, people will sample that more frequently than if it had a low event rate – something that is frequently updated gets visual visits more often than something that is static or updates more slowly – think car gauges, we sample spedometer more often than engine temperature.Contextual relevance – the context of events that have happened there previously suggest that information is now available there. There is a cue that there is information there – usually an alarm or indication.Info value – the expected value to be gained, or lost, if the info is not noticed
  • 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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