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Lecture 5

Lecture 5 - Sensory Processing

7 Pages
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Department
Psychology
Course Code
PSY290H1
Professor
Franca Placenza

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Intro to Sensory Systems
1.Five classic senses
oVision
oAudition
oTaste
oSmell
oTouch
2.More like 5 groups of sensations
oVision
oAudition
oChemical senses
Taste
Smell
oSomatic senses
Touch
Pain
Temperature
Proprioception - ability to sense the position of body parts in relation
to
everything else
oVestibular sensation
3.Major components of sensation
oSensory receptor cells
oTransduction - physical stimulus to neural stimulus
oCentral pathways - can't perceive stimuli without the brain
Sensory Receptor Cells
4.Distinct cells for each sensory systems
oSpecific physiological properties
Transduction
5.The way one neuron can communicate with another neuron
oA conversion of signals
6.Receptors on cells that respond to certain stimuli
Central Pathways
7.We have sensory cortices
Touch
8.Can experience touch in a number of different ways
oEX = tingly, vibrations, stretching
9.3 layers of the skin
10.Mechanoreceptors = receive tactile information
www.notesolution.com
o4 main types
Pacinian corpuscle
The largest one
found in the bottom layer of the skin (hypodermis)
Made up of a bundle of connective tissue with axon in middle
Ruffini's corpuscle or ending
Found in hypodermis
Connective tissue that surrounds axon tip
Meissner's corpuscle
Merkel's disks
Found in layer between epidermis and dermis
Most sensitive
Many found in tongue, lips, and finger tips
11.Each receptor has distinct receptive field
oPacinian corpuscle & Ruffini's ending
Large receptive field (almost half of hand's palm or whole finger)
Not very good at spatial discrimination
oMeissner's corpuscle & Merkel's disk
Small, sharp borders
Fine discrimination of touch
12.Rates of response
oFast adapting stimulus (only fire when stimulus is present and comes off)
Pacinian corpuscle
Meissner's corpuscle
oSlow-adapting stimulus (fires continually when stimulus is on until it stops
and then stops firing)
Merkel's discs
Ruffini's ending
Transduction
13.In Pacinian corpuscles:
oEasiest cell to measure because it is the largest mechanoreceptor
oMechanical stimulus deforms the corpuscle (connective tissue)
oResults >> the ion channels on the axon tip get bigger
These ion channels are not voltage or chemically gated (mechanically
gated)
Ions passively enter the cell (depolarizes the cell)
oGenerator potentials are created once ions enter axon
Very similar to post-synaptic potentials (graded in strength)
Occurs in axon tip and passively spreads down axon
oAction potential equivalents are called spike potentials in these cells
Central Touch Pathways
www.notesolution.com

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Description
Intro to Sensory Systems 1. Five classic senses o Vision o Audition o Taste o Smell o Touch 2. More like 5 groups of sensations o Vision o Audition o Chemical senses Taste Smell o Somatic senses Touch Pain Temperature Proprioception - ability to sense the position of body parts in relation to everything else o Vestibular sensation 3. Major components of sensation o Sensory receptor cells o Transduction - physical stimulus to neural stimulus o Central pathways - cant perceive stimuli without the brain Sensory Receptor Cells 4. Distinct cells for each sensory systems o Specific physiological properties Transduction 5. The way one neuron can communicate with another neuron o A conversion of signals 6. Receptors on cells that respond to certain stimuli Central Pathways 7. We have sensory cortices Touch 8. Can experience touch in a number of different ways o EX = tingly, vibrations, stretching 9. 3 layers of the skin 10.Mechanoreceptors = receive tactile information www.notesolution.com
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