F10_L07_olf_taste

F10_L07_olf_taste - Psy 111 Basic concepts in Biopsychology Lecture 7-9 Sensory Systems Objectives Describe the general principles of sensory

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Psy 111 Basic concepts in Biopsychology Lecture 7-9 : Sensory Systems
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Objectives Describe the general principles of sensory system organization. Define transduction and the various types of stimuli that the body detects. Explain the role of the thalamic relays in sensory systems. Illustrate parallel pathways and the importance of lateral inhibition. escribe topographical arrangement and hierarchical designs Describe topographical arrangement and hierarchical designs. Define the two chemical senses. Describe the process of odor detection and how specific ordants re encoded are encoded. Describe the role of olfactory bulb as a sensory relay and processor. Describe the projections from the OB to higher areas of the brain. pj g Describe the tongue and the detection of chemical tastants. Describe how different tastes are encoded. Define the central pathways of taste.
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Sensory Systems I - III “getting info encoded in the primary sensory cortex” rinciples of sensory systems 1. Principles of sensory systems 2. Chemical sensory systems yy 3. Vision: the photic sensory system 4. Hearing & Touch: the mechanical sensory systems
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What is sensation? Sensation = the process of obtaining information about the environment and transmitting it to the brain for processing. Perception = the process of interpreting sensory signals sent to the p p pg yg brain. •I m portantly, the latter process involves conscious processes which are poorly understood. • Thus, we will focus on the former process to keep things simplified…
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What is a sensory system? • System = collection of neurons working together to carry out a “process” (e.g. detect information; store information, etc). Sensory systems = neurons detecting information about outside or internal environment. hese form discrete pathways from site of detection to brain These form discrete pathways from site of detection to brain systems involved in making sense of info (i.e. perception). – Each discrete pathway is sensitive to a single type or “mode” of information (i.e. light, touch, etc). • Thus, a given sensory system comprises neurons found throughout e discreet and often distant parts of the body/nervous system the discreet and often distant parts of the body/nervous system which function together to process information.
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Principles of Sensory Systems Transduction Mechanism – environmental energy -> biological energy Receptive fields – each transducing cell or neuron is “receptive” to info from a specific subset of sensory information…often defined anatomically Parallel Pathways – “quality” of information is maintained Relay Centers – series of projection neurons Topographically arranged – “shape” of information is maintained Hierarchical organization – convergence at relays to cortex Cross Midline – it just does… Note: like all rules there are exceptions….
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Transduction Mechanisms Transduction = conversion of stimulus energy into neural energy
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This note was uploaded on 12/18/2010 for the course PSYCH 111 taught by Professor Kippen during the Fall '08 term at UCSB.

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F10_L07_olf_taste - Psy 111 Basic concepts in Biopsychology Lecture 7-9 Sensory Systems Objectives Describe the general principles of sensory

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