Fall 2002CS/PSY 67501 Human Capabilities Why do we care? (better design!) Want to improve user performance Knowing the user informs the design  Senses.

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Presentation transcript:

Fall 2002CS/PSY Human Capabilities Why do we care? (better design!) Want to improve user performance Knowing the user informs the design  Senses  Information processing systems  Physical responding Time and effort expended to complete tasks

Fall 2002CS/PSY I. Senses Sight, hearing, touch important for current HCI  smell, taste ??? Abilities and limitations affect design

Fall 2002CS/PSY Vision Visual System  Eye  Retina  Neural pathway ~ 80% of brain’s operation

Fall 2002CS/PSY Visual Abilities Sensitivity  luminance: ~10 7 mL (see notes) Acuity  detection, alignment, recognition (visual angle)  retinal position: fovea has best acuity Movement  tracking, reading, vibrations Note: Vision decreases with age Implications (??)  Font size & location depends on task  Much done by context & grouping

Fall 2002CS/PSY Color Sensory response to electromagnetic radiation in the spectrum between wavelengths micrometers 0.5 visible gammaultravioletmicrowavetv

Fall 2002CS/PSY Color Vision

Fall 2002CS/PSY Color Vision Color & the retina  380 (blue) ~ 770nm (red)  Problems with cones or ganglion cells causes problems with color perception  (Not really “color blindness”) 8% males, 0.5% females Implications (??)  Avoid saturated colors  Color coding should be redundant when possible

Fall 2002CS/PSY Hearing Capabilities (best-case scenario)  pitch - frequency ( ,000 Hz)  loudness - amplitude ( dB)  location (5° source & stream separation)  timbre - type of sound (lots of instruments) Often take for granted how good it is (disk whirring) Implications (??)

Fall 2002CS/PSY Touch Three main sensations handled by different types of receptors:  Pressure (normal)  Intense pressure (heat/pain)  Temperature (hot/cold) Sensitivity, Dexterity, Flexibility, Speed Where important?  Mouse, Other I/O, VR, surgery

Fall 2002CS/PSY III. Motor System Capabilities  Range of movement, reach, speed, strength, dexterity, accuracy Often cause of errors  Wrong button  Double-click vs. single click Principles  Feedback is important  Minimize eye movement