4. Visual Sensory Systems - Korea University · 2019. 3. 12. · 고려대학교산업경영공학과 IMEN 315 인간공학 Contrast Sensitivity A person with normal visual acuity

고려대학교산업경영공학과

IMEN 315 인간공학

4. Visual SensorySystems



THE STIMULUS: LIGHT



Hue

Brightness







THE RECEPTOR SYSTEM: THE EYEBALL AND THE OPTIC NERVE







The Visual Receptor System1. Location2. Acuity3. Sensitivity4. Color sensitivity5. Adaptation6. Differential wavelength sensitivity



SENSORY PROCESSING LIMITATIONS



Contrast Sensitivity



Contrast Sensitivity

A person with normal visual acuity but poor contrast sensitivity might see the trees in the foreground clearly (high contrast), but have trouble seeing the contours of the mountains against the sky in the background (low contrast).

The Pelli Robson contrast sensitivity chart tests your ability to detect letters that are gradually less contrasted with the white background as your eyes move down the chart.



Color SensationNight Vision



BOTTOM-UP VS TOP-DOWN PROCESSING





DEPTH PERCEPTION



Depth cuesBottom-up processing

AccommodationConvergenceBinocular disparity (stereopsis)



Top-down processingLinear perspectiveRelative sizeInterpositionLight and shadingTextural gradients

Relative motion (motion parallax)





VISUAL SEARCH AND DETECTIONWhere’s Wally?

http://en.wikipedia.org/wiki/File:MartinHandfordWally&Friends.PNG

http://en.wikipedia.org/wiki/File:MartinHandfordWally&Friends.PNG



Where’s Wally?



Eye Movement



Visual SearchThe Serial Search ModelExpectancies



Visual SearchConspicuityConclusions



DetectionSignal Detection Theory



DetectionSensitivity and Response Bias

higher sensitivity

conservative



DetectionIntervention



ABSOLUTE JUDGMENT



THE OTHER SENSES



Touch: Tactile and Haptic SensesProprioceptive and KinesthesisThe Vestibular Senses

Documents

4. Visual Sensory Systems - Korea University · 2019. 3. 12. · 고려대학교산업경영공학과 IMEN 315 인간공학 Contrast Sensitivity A person with normal visual acuity