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Questions?• Project #1Human Information Processor(Card, Moran, Newell)Perceptual Processor• Physical store from our senses: here sight• Decoded for transfer to working memory– Progressive• Example: 10ms/letter– Selective• Spatial• Pre-attentive: color, direction…• Capacity– Example: 17 lettersPre-attentive perception: How many 3s?From Information Visualization, C. WarePre-attentive perception: How many 3s?From Information Visualization, C. WareWhere are the cherries?From Information Visualization, C. WareWhere are the cherries?From Information Visualization, C. WareOther examples of pre-attentive variablesFrom Information Visualization, C. WarePerceptual Processor• Decay: 200msPerceptual Processor• Cycle time– Quantum experience: 100ms• Percept fusion• CausalityWorking Memory• Access in chunks– Task dependent construct– 7 +/- 2 (Miller)• Decay – Content dependant– Limit attention spanLong term memory• Very large capacity– Semantic encoding• Associative access– Fast read: 70ms– Expensive write: 10s• Several Rehearsal and/or recall, • Context at the time of acquisition key for retrieval•NoisyCognitive Processor• Cycle time: 70ms– Can be modulated• Typical matching time– Digits: 33ms– Colors: 38ms– Geometry: 50ms…• Fundamentally serial– One locus of attention at a time• Eastern 401, December 1972– Crew focused on checking the landing gear indicator bulb,– Meanwhile the aircraft is loosing altitude (horn, warning indicator…),– Aircraft crashed in the Everglades– see “The Human Interface” by Raskin, p25• But what about driving and talking?Motor Processor• Receive input from the cognitive processor• Execute motor programs– Pianist: up to 16 finger movements per second– Point of no-return for muscle


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