F10_L10_auditory_somatosensation

F10_L10_auditory_som - Psy 111 Basic concepts in Biopsychology Lecture 9 Auditory and Somatosensory Systems Objectives Describe the nature and

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Psy 111 Basic concepts in Biopsychology Lecture 9: Auditory and Somatosensory Systems
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Objectives Describe the nature and properties of sound. Identify the route of sound to the ear and where transduction occurs. Explain the organization of the cochlea and the organ of corti. Describe the transduction of sound waves and the maintenance of sound properties. Describe the output pathway from the ear to the cortex and how sound properties of encoded. Identify the transducers for the vestibular system and related circuitry Introduce language localization in the brain as a higher-order association area; describe its lateralization. Define the somatosensory system(s) and describe differences in sensitivity. Describe the variety of transduction systems in somatosensation and their response profiles. Define the sub-systems of somatosensation. Explain why pain is considered to be multimodal. Describe the variety of afferent fibers (axons) used by the subsystems. Compare the parts of the spinal cord of ascending paths taken by touch versus pain information in somatosensation. Describe the central paths taken by touch (from the body), touch (from the face), and pain. Explain the mapping of somatosensory info on the postcentral gyrus. Describe function of the higher somatosensory cortices.
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Principles of Sensory Systems Transduction Mechanism - envirnomental energy -> biological energy Receptive fields – each neuron is “receptive” to info from a specific subset of sensory information…often defined anatomically Topographically arranged – “shape” of information is maintained Relay Centers – series of projection neurons Parallel Pathways – “quality” 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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Sensory systems “getting info encoded in the primary sensory cortex” 1. Principles of sensory systems 2. Chemical sensory systems 3. Vision: the photic sensory system 4. Hearing & (Touch): the mechanical sensory systems
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Sound waves = compressions in air produced by vibrations
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Properties of Sound Waves Frequency = pitch Human range is 20 – 20K Hz Intensity = loudness Real sounds are complex mixtures of frequencies & intensities
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Properties of Sound Waves Real sounds are a mixture of waves with different amplitudes and frequencies which give complexity to hearing.
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Structure of the Ear Outer ear serves to focus sound waves and involved in localization of sound
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Middle ear serves to transfer air compressions (of the outer ear) to fluid compressions (of the cochlea). This process also greater amplifies force of wave.
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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_L10_auditory_som - Psy 111 Basic concepts in Biopsychology Lecture 9 Auditory and Somatosensory Systems Objectives Describe the nature and

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