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PSY 3031 Week 2 Notes

by: Naomi Terpening

PSY 3031 Week 2 Notes PSY 3031

Marketplace > University of Minnesota > Psychology > PSY 3031 > PSY 3031 Week 2 Notes
Naomi Terpening
U of M

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About this Document

These notes cover only the required readings. If I have time, I will also put up notes over the optional readings and/or the slides.
Introduction to Sensation and Perception
Dr. Stephen Engel
Class Notes
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This 2 page Class Notes was uploaded by Naomi Terpening on Tuesday September 13, 2016. The Class Notes belongs to PSY 3031 at University of Minnesota taught by Dr. Stephen Engel in Fall 2016. Since its upload, it has received 73 views. For similar materials see Introduction to Sensation and Perception in Psychology at University of Minnesota.


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Date Created: 09/13/16
PSY 3031 Week 2 Notes (Note:  These are over the required readings) Touch, Thermoception, and Nociception  Receptors in the skin o Meissner’s corpuscles:  pressure and lower frequency vibrations o Pacinian corpuscles:  transient pressure and higher frequency vibrations o Merkel’s disks:  light pressure o Ruffini corpuscles:  stretch  Free nerve endings o Receptors for thermoception and nociception o Thermoception:  temperature o Nociception:  potential harm and pain  Pain Perception o Physical and psychological components o Adaptive qualities of pain  Creates awareness of injury  Motivation to leave and avoid whatever hurt you o Neuropathic vs. inflammatory  Inflammatory pain:  signals tissue damage  Neuropathic pain:  damage to neurons  Causes pain that is exaggerated o Congenital analgesia:  genetic disorder in which the person can’t feel pain Sensory Pathways  Different parts of the CNS work with different somatic processes  We’re looking at the spinal cord and brain stem in this reading Spinal Cord and Brain Stem  Ascending pathway:  carries peripheral sensations to the brain (PNS to CNS)  Somatosensory pathways have two systems based on location o Information that comes from the body below the neck goes through the  spinal cord o Information from the head and neck goes through cranial nerves  Two major pathways that lead from the body to the brain o Dorsal column system:  major sensory pathway to the brain composed of  three neurons; primarily for touch and proprioception  Axon from dorsal root ganglion joins dorsal column white matter  in the spinal cord which has two tracts  Fasciculus gracilis:  axons from the legs and lower body  Fasciculus cuneatus:  axons from arms and upper body  These axons end in the medulla where they meet the second  neuron  Nucleus gracilis:  target of fasciculus gracilis  Nuceus cuneatus:  target of fasciculus cuneatus  Second neuron comes out from one of those nuclei and decussates  the medulla  Decussate:  cross midline  Medial lemniscus:  bundle of fibers formed as these axons  continue up the brain stem  They end in the thalamus where they meet the third neuron  Third neuron connects to postcentral gyrus in the cerebral  cortex and perception occurs o Spinothalamic tract:  major sensory pathway composed of three neurons;  primarily for pain and temperature  Axons extend from dorsal root ganglion to dorsal horn where they  meet the second neuron  Second neuron’s cell body in the spinal cord gray matter  Axons decussate then connect to thalamus where they meet the  third neuron  Axons then extend to postcentral gyrus in the cerebral  cortex


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