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IAT 201 (8)

IAT201 Week 8.docx

3 Pages

Interactive Arts & Tech
Course Code
IAT 201
Brian Fisher

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IAT201 Week 8 Perception High-Bandwidth Interaction Design Much of HCI, information design came from studies and design experience with traditional computer displays We must design increasingly complex interactive displays that can be perceived and understood by users Individual differences are important Vision: acuity, focus, stereo sensitivity, colour blindness… Hearing: sensitivity, noise filtering, environment Application goals are more likely to be cognitive, social, and experiential Design & the “Metacognitive Gap” Intuitions about thoughts, goals and plans (“folk psychology”) are good Intuitions about how people see, hear, and remember are very inaccurate -lack of awareness of the limits of intuition is the “Metacognitive gap” Problem for design-by-intuition “The eye is like a camera” -it contains lenses that focus an image on the eyeball Touch is exploratory and serial Vision is not parallel and instantaneous -it is also exploratory Both senses fill in a “gappy” picture which we believe is complete Intuition: Visual buffer accumulates data Rapid visual perception Non-conscious visual processing -rapid: < 200 ms -automatic (no conscious effort) -spatially parallel -local operations -volatile (poor temporal coherence) Impressions, some motor performance Direct attention for cognitive processing “Logic of Perception” (I. Rock) aka “visual intelligence” 1. Transduction stage (light to pixels-retinal color) -minimal interactions 2. Primary processing (pixels to edges-retinal orientation) -local inhibition/excitation Pre-attentive Vision Unique color is easy to spot when few other items around Also easy to spot when many other items around Similarly with Orientation Unique orientation is easy to spot when few items around Also easy to spot when many other items around Note: Unique items are not always easy to notice -gets more difficult as more items are in display Rapid search-visual primitives calculated in absence of atten
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