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Sensory Systems Lecture 12
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Sensory Information Detection of changes in environment
external or internal 4 main functions perception control of movement regulation of body function maintenance of arousal Not all conscious experience ~
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Sensation vs. Perception
detection of stimulus 1st interaction with NS filtering Perception integrated of information selected, organized & interpreted Different perceptions of same event ~
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Sensory Receptors Specialized cells similar properties to neurons
Transduction environmental energy neural signal receptor potential ~
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Sensory Receptors Mechanoreceptors auditory, somatosensory
Chemoreceptors taste, smell Photoreceptors vision Thermoceptors hot, cold ~
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Sensory Information: 4 types
Modality visual vs. pain vs. auditory, etc. Doctrine of specific nerve energies Intensity frequency code Duration fast & slow adapting receptors Location receptive fields ~
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Cortical Organization
Topographic area in receptive field mapped onto cortex Examples cochlea A1 retina V1 dermatomes S1 ~
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Organization of Pathways
Hierarchical (serial) receptor 1st order neuron higher order neuron levels: different processing function Parallel (simultaneous) different submodalities color vs. monochrome vision pain vs. touch converge at higher cortical levels ~
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Sensory Modalities Auditory timbre pitch Vision color shape motion ~
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Sensory Modalities Chemical senses Gustatory – taste Olfactory - smell
Orienting senses vestibular system head orientation, rotation, balance mechanoreceptors in middle ear ~
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Sensory Modalities: Somatosensation
Primarily mechanoreceptors Touch pressure, vibration Kinesthesis body position & movement ~
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Sensory Modalities: Somatosensation
Pain (stretch receptors) itch (chemoreceptors) temperature (thermoreceptors) Haptic System touch & kinethesis
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