ICS 463, Intro to Human Computer Interaction Design: 3. Perception Dan Suthers.

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Presentation transcript:

ICS 463, Intro to Human Computer Interaction Design: 3. Perception Dan Suthers

What’s the big deal?

Constructivist Theories Computations on representations to match models Evidence: Size and shape constancy Influence of context and expectations ACM Crossroads 3(1)

Ecological Theories Affordances and flow over time coordinate action in the world Examples: Optical flow Graspable, pushable objects

Gestalt Principles Proximity: objects close together Similarity: objects of same shape, color Closure: missing parts filled in Continuity: lines seen as continuous Symmetry: symmetric elements perceived as coherent figures

Three-dimensional cues Size: larger is closer Interposition and Shadows: obscured object is behind Contrast, clarity, brightness decrease at a distance Texture finer at a distance Motion Parallax Stereoscopic cues

Graphical Representation: Coding Arbitrary mappings –“Red = danger” Nonarbitrary mappings –Size => size, width => width, etc. Iconic (resemblance) –File “folder” Virtual reality

Graphical Representation: Fidelity How realistic? High cost versus value Compensate with mental simulation

Processing Considerations Parallel Detection: color, value, angle, slope, length, texture Serial Detection: shape, area, curvature, orientation, connection, containment Comparing Representations (Lohse examples, Handbook ofHCI; Tullis)

Uses of Color Segmentation: grouping related objects Highlighting: –Drawing attention to important item –Distinguishing figure from ground Search (by novices) No advantage for many tasks Avoid excessive use