lecture 6 - PSC 1-3 Lecture 6 Page 1 of 4 Announcements...

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PSC 1-3 Lecture 6 Page 1 of 4 Announcements: Midterms are available on reserve at the Shield’s Library Website under reserve then list of exams. Last Lecture: We continued our discussion on cones and how they allow us to see in color. We also discussed the optic nerve and the Gestalt principles of organization. Finally, we talked about the auditory system and the different parts of the ear. This Lecture: I. Olfaction (the sense of smell) and Gustation (the sense of taste) a. Both of these senses affect one another. i. Flavor is the combination of both smell and taste. ii. It is true that if you plug your nose when you are eating something you will not be able to taste it as much. b. Olfactory receptors one of the few sensory receptors that are located on the outside of the body. This means that they have to be replaced frequently (3 to 4 weeks) c. The papillae are the bumps located on the tongue. Located in the papillae are the taste buds. Taste buds are replaced around every 10 days. i. There are four flavor regions on your tongue—the combination of these produces taste. They are the sweet, salty, sour, and bitter flavors. d. The olfactory bulb is found on the olfactory receptor. i. It projects directly to the amygdala. The phenomenon of one trial learning occurs because of this. 1. This is when something makes you sick once, and every time after that you come in contact with it, the amygdala sends off the “fight or flight” response so you do not want to eat/ drink it again. II. The sense of Touch, which causes pain. a. Mechano receptors cause transduction (feeling of touch). i. This projects information to the thalamus which projects it to the parietal lobe. b. Nociceptors are transduce the feeling you get to neural energy, which in turn makes you feel pain. i. Aspirin minimizes distress calls from dying cells to reduce the action of the nociceptors.
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