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SENSATION & PERCEPTION Sensation: - how our sensory receptors & nervous system receive & represent stimulus energy Perception: - selection, organization, & interpretation of sensory input FUNCTION OF SENSATION - provides info about immediate internal & external environment Visceral sensation Body position Movement Muscle tension Organ function - protection - social communication THE SENSES Sense What is detected? Vision light/electromagnetic energy Audition Sound waves & change in air pressure Touch Pressure, weight, temp, movement Olfaction (Smell) Chemicals via nasal mucosa Accessory StructureSensory ReceptorsVision Gustation (Taste) Chemicals via taste buds - eye lens- photoreceptors (retina)Audition (Hearing)- outer ear, cochlea- hair cells in cochleaTouch- skin, glands, hair- mechanoreceptors (skin)Gustation (Taste)- nose, nasal passage- chemoreceptors (nasal mucosa)Olfaction (Smell)- oral cavity- chemoreceptors (taste buds) **** STIMULATION OF A PARTICULAR SENSORY NERVE PROVIDES CODING FOR THAT NERVE**** Coding: Pattern of neural activity Psychophysics: Study of how physical stimuli relate to psychological experience Threshold: Dividing point between energy levels that do & do not have detectable effect Just Noticeable Difference (JND): Smallest difference of stimulation that can be noticed Sensory Adaptation: Gradual decline in sensitivity to prolonged stimuli
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WEBER’S LAW To be perceived as different, 2 stimuli must differ by a minimum percentage. The size of a JND is a proportion of the size of the initial stimulus VISION THE EYE PEUMONIC “Condoms Put Lube In Fun Regions” Eye Parts Where/What Cornea - refracts light to allow lens to focus Pupil - regulates how much light enters - Dilate (↑ light, ↓ clarity) - Constrict (↓ light, ↑ clarity) Lens - refracts light to be focused on retina Iris
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