ch4_sens&perc_09_16_09

ch4_sens&perc_09_16_09 - Olfaction Smell is vital...

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The Chemical Senses Olfaction Olfaction is another term for the sense of smell. The receptors for smell are located in the mucous membranes in the rear air passages of the nose. They detect the presence of airborne molecules of chemicals.
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Figure 4.30 Figure 4.30 Olfaction, like any other sensory system, converts physical energy into a complex pattern of brain activity.
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The Chemical Senses Olfaction We are aware now that there are at least hundreds of types of olfactory receptors Other mammals have many more receptors than humans do. Each type of olfactory receptor is extremely specialized for one small group of closely related chemicals.
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Figure 4.29 Figure 4.29 The olfactory receptor cells lining the nasal cavity send information to the olfactory bulb in the brain. There are at least 100 types of receptors with specialized responses to airborne chemicals.
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The Chemical Senses
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Unformatted text preview: Olfaction Smell is vital for food selection. Neurons in the prefrontal cortex receive both taste and olfactory input, and combine them to produce the perception of flavor . The olfactory tract also bypasses the relay system in the thalamus. It travels to the olfactory bulb, a structure in the base of the brain that is directly in contact with the limbic system. The Chemical Senses Olfaction Especially in nonhuman mammals, olfaction plays a vital social role. These animals rely heavily on pheromones, chemicals that they release into the environment. Humans prefer not to rely upon the social influences of pheromones and olfaction. Pheromones are important for sexual communication; seem to be related to menstrual cycle synchrony Synesthesia http://www.youtube.com/watch? v=D05bXV1EnAc&feature=related...
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ch4_sens&perc_09_16_09 - Olfaction Smell is vital...

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