4. Visual Sensory Systems

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Presentation transcript:

4. Visual Sensory Systems

THE STIMULUS: LIGHT

Brightness Hue

THE RECEPTOR SYSTEM: THE EYEBALL AND THE OPTIC NERVE

The Lens Iris Cornea

The Visual Receptor System Location Acuity Sensitivity Color sensitivity Adaptation Differential wavelength sensitivity

SENSORY PROCESSING LIMITATIONS

Contrast Sensitivity Color Sensation Night Vision

BOTTOM-UP VS TOP-DOWN PROCESSING

Depth perception

Depth cues Bottom-up processing Accommodation Convergence Binocular disparity (stereopsis)

Relative motion (motion parallax) Top-down processing Linear perspective Relative size Interposition Light and shading Textural gradients Relative motion (motion parallax)

VISUAL SEARCH AND DETECTION Where’s Wally?

Where’s Wally?

Eye Movement

Visual Search The Serial Search Model Conspicuity Expectancies Conclusions

Detection Signal Detection Theory Sensitivity and Response Bias Intervention higher sensitivity conservative

Absolute JUDGMENT