Olfaction - 13 13 Olfaction Chapter 13 Olfaction Olfactory...

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13 Olfaction Chapter 13 13 Olfaction • Olfactory Physiology • From Chemicals to Smells • Olfactory Psychophysics, Identification, and Adaptation • Olfactory Hedonics • Olfaction, Memory, and Emotion 13 Olfactory Physiology Odors: Olfactory sensations – Chemical compounds. – But not every chemical is odorant. – In order to be smelled: Molecule must be volatile, small, and hydrophobic.
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13 Odorants 13 Olfactory Physiology The human olfactory apparatus: – Primary purpose of nose: to filter, warm, humidify air we breathe. – Nose: Small ridges, olfactory cleft, olfactory epithelium. 13 The Nose
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13 Olfactory Physiology The olfactory epithelium: the “retina” of the nose: – Three types of cells: – 1. Supporting cells – 2. Basal cells – 3. Olfactory sensory neurons (OSNs)—cilia protruding into mucus covering olfactory epithelium 13 Olfactory Physiology The olfactory epithelium: the “retina” of the nose: – Olfactory receptors (ORs): Interaction between these and odorant stimulates cascade of biochemical events 13 Olfactory Sensory Neuron
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13 Olfactory Perception Pathway 13 Olfactory Physiology Olfactory loss can cause great suffering: – Sense of taste. – Danger warning. 13 Olfactory Physiology Olfactory receptor cells are different from all other sensory receptor cells: They are not mediated by any protective barrier, make direct contact with brain. – (e.g., visual receptors are protected by cornea, receptors for hearing are protected by eardrum, taste buds are buried in papillae). – Therefore many drugs can be inhaled.
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13 Olfactory Physiology Olfactory receptor cells are different from all other sensory receptor cells: They are not mediated by any protective barrier, make direct contact with brain. – OSN axons are among thinnest and slowest in body. – Therefore it takes a long time to perceive odors compared to other perceptions. 13 Olfactory Physiology Subtle differences between sensation and perception: – Sensation occurs when scent is neurally registered. – Perception occurs when becoming aware
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This note was uploaded on 03/09/2010 for the course PSY 4283 taught by Professor Ahmad during the Fall '09 term at Henderson.

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Olfaction - 13 13 Olfaction Chapter 13 Olfaction Olfactory...

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