PSYC30020 Lecture Notes - Lecture 5: Tetraodontidae, Red Meat, Spasticity
10 May 2018
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Lecture 5
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- Why motor control: psychology is the study of the mind and behaviour
- Behaviours: range of actions/mannerisms that enable us to interact with each
other/environment
- Some psychologists believe: the ultimate function of the brain and the nervous
system is to control behaviour (move muscles)
- What use would the mind be if we couldn’t move our muscles?
- Locked in syndrome: awake, cognitively intact, paralysed (eyes sometimes spared),
brainstem stroke or sometimes infections in brainstem or pons
- Brain is essential for behaviour
- E.g. sea squirt: larvae → brain in head and big tail for swimming; adult → attaches to a
rock for the rest of life and eats its own brain; once the need to move is lost so is the
brain
- E.g. blindsight: ability of cortically blind [eyes and nerves from eyes are intact] people
to respond to visual stimuli that they don’t consciously see (navigate around objects);
how is the motor system getting information about the location of objects when the
man can’t see
find more resources at oneclass.com
find more resources at oneclass.com
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- Three kinds of muscle cells/fibers: skeletal (striated) → responsible for voluntary body
movements; smooth → gut and lungs; cardiac → heart
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- Skeletal muscle: many; agonist/antagonist (flexor/extensor); muscles only make one
movement (contract)
find more resources at oneclass.com
find more resources at oneclass.com
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- Isotonic [moving consistent carryable weight] versus isometric [carrying something
heavy] contractions
- Mechanism the same: sliding filament theory
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- Skeletal muscle anatomy: many muscles fibres in each muscle; each muscle fibre
innervated by one axon, but one axon innervates many fibres
- Fibre types - fast twitch (anaerobic, sprints), slow twitch (aerobic, marathon)
- Bone - tendon - muscle
- Eyes, fingers → a few muscle fibres innervated by each motor nerve
- In the back or leg → don’t really need fine control of movement, may have hundreds
of muscle fibres innervated by one nerve
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Behaviours: range of actions/mannerisms that enable us to interact with each. Why motor control: psychology is the study of the mind and behaviour other/environment. Some psychologists believe: the ultimate function of the brain and the nervous system is to control behaviour (move muscles) Locked in syndrome: awake, cognitively intact, paralysed (eyes sometimes spared), brainstem stroke or sometimes infections in brainstem or pons. Three kinds of muscle cells/fibers: skeletal (striated) responsible for voluntary body movements; smooth gut and lungs; cardiac heart. Skeletal muscle: many; agonist/antagonist (flexor/extensor); muscles only make one movement (contract) Isotonic [moving consistent carryable weight] versus isometric [carrying something heavy] contractions. Skeletal muscle anatomy: many muscles fibres in each muscle; each muscle fibre innervated by one axon, but one axon innervates many fibres. Fibre types - fast twitch (anaerobic, sprints), slow twitch (aerobic, marathon) Eyes, fingers a few muscle fibres innervated by each motor nerve.
