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Chapter 3: Detection of Sensory Signals
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  1. Chapter 3: Detection of Sensory Signals Sensation: activity of receptor organs Perception: interpretation of sensory system activity Absolute vs. Difference Thresholds Thresholds affected by stimulus energy and motivation of subject to detect signal Signal Detection theory: method of combining factors to more accurately measure thresholds.

  2. Eye

  3. Retina and photoreceptors

  4. Rods: 125 mil; low light; color blind; peripherally located Cones: 7mil; daylight; color vision; centrally located

  5. Illusions: Hermann Grid

  6. Illusions: Rotating snakes

  7. Illusions: Muller Lyer

  8. Ambiguous figures

  9. Signal Detection Theory 100 % Hits 50 0 100 0 50 % False Alarms

  10. Eye movements during reading

  11. Perceptual Span: How much info gathered in brief glance at visual pattern? • Relevance to reading • Saccadic eye movements: .25sec • Early studies: 4.5 unconnected letters; whole report technique; ‘reading off visual icon’ • 1960 Partial report technique of George Sperling H K Z High tone P L V Medium tone T M Q Low tone