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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.
Rods: 125 mil; low light; color blind; peripherally located Cones: 7mil; daylight; color vision; centrally located
Signal Detection Theory 100 % Hits 50 0 100 0 50 % False Alarms
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