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sensation lecture - Sensation Jamal Mansour...

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Sensation Jamal Mansour [email protected]
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Sensation vs. Perception Sensation Stimulation of sense organs Passive Perception Selection, organization and interpretation of sensory input Active
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What letter do you see?
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Sensation vs. Perception
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Psychophysics Gustav Fechner (1801-1887) Thresholds dividing point between energy levels that do and do not have a noticeable effect
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Thresholds Absolute threshold Minimum amount of stimulation that an organism can detect for a specific sensory input Difference threshold Minimum difference between two stimuli for the person to be able to detect them as different aka Just noticeable difference (JND)
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Absolute Thresholds Vision candle flame at 50 kilometers on a clear night
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Absolute Thresholds Hearing tick of a watch at 6 metresin a quiet room
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Absolute Thresholds Taste one teaspoon of sugar in 2 gallons of water
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Absolute Thresholds Smell 1 drop of perfume in a 3 room apartment
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Absolute Thresholds Touch the wing of bee falling on your cheek from 1 centimeter
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Signal Detection Theory Response bias Tendency to say “yes” or “no” that a stimulus is present Decision criterion How much evidence is needed to say a stimulus has been detected
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Signal Detection Theory Stimulus Yes No Response Yes Hit False Alarm No Miss Correct Rejection
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Signal Detection Task Read Listen
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The Five Senses Vision Hearing Touch Taste Smell
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Vision –the stimulus We sense only a small range of light waves
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Vision –the stimulus Saturation is related to the purity of the wavelengths
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Vision –the stimulus gatherer
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Vision –the stimulus gatherer
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