Lecture+5--Sensation+_+Perception+3+slides

Lecture+5--Sensation+_+Perception+3+slides - SENSATION...

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10/11/10 1 SENSATION & PERCEPTION Outline What are sensation and perception? Vision: Do we really see what we think we see? Hearing & the Vestibular System Pain: What happens when we can’t feel? Definitions Sensation Detection of physical energy by sense organs Information sent to the brain Sensory input has no meaning on its own Perception The brain’s interpretation of raw sensory inputs Processing, organization, and interpretation of sensory signals Assembly of signals into a meaningful mental representation of stimulus
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10/11/10 2 How is sensory information sent to the brain? Types of neurons: Sensory Interneurons Motor How does the information get into the sensory neurons? Our senses! Makes sense Q: How many senses do we have? A: Lots Our senses: Vision Audition (hearing) Chemical senses Olfaction (smell) Gustation (taste) Body senses Somatosensory (Touch, temperature and pain) Vestibular (Equilibrium) Proprioception (Body position) Links to the Nervous System Thalamus Sensory relay station/gateway to cortex Except smell Contralateral connections Right side of body Left hemisphere Left side of body Right hemisphere
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10/11/10 3 Sensory Cortex Smell Tast e Remember: The brain works in action potentials Transduction The language of the nervous system—action potentials Change is good Sensory adaptation A decline in activation within a sense receptor after initial activation Our senses love variation And it helps us to conserve energy and resources!
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10/11/10 4 Definitions Sensation Detection of physical energy by sense organs Information sent to the brain Sensory input has no meaning on its own Perception The brain’s interpretation of raw sensory inputs Processing, organization, and interpretation of sensory signals Assembly of signals into a meaningful mental representation of stimulus From Sensation to Perception 1. Stimulus 2. Sensation 3. Sensory Coding 4. Perception A green light emits physical properties in the form of protons (light waves). Sensory receptors in the driver’s eyes detect this stimulus. The stimulus is transduced. The driver’s brain processes the neural signals and constructs the representation as a green light. Green Means Go! How do we see? Do we really see what we think we see? Vision
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5 Visual Input Light waves Visual Input: Brightness Light waves Brightness (the intensity of the reflected light that reaches our eyes) is determined by the wave’s amplitude (height) Quantitative coding Rate of action potentials Visual Input: Hue Light waves Brightness (the intensity of the reflected light that reaches our eyes) is determined by the wave’s amplitude (height) Hue (color) is determined by wavelength Distance from one peak to the next Qualitative coding Different receptors activated
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This note was uploaded on 11/21/2010 for the course PSC 001 taught by Professor P during the Spring '08 term at UC Davis.

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Lecture+5--Sensation+_+Perception+3+slides - SENSATION...

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