Download Sensory and Motor Systems

Sensory and Motor
Systems
Psychology 2617
Introduction
The nervous system basically goes
sensory -> inter -> motor neurons
 You convert energy from the environment
to energy in your nervous system
 This is called transduction
 Agnosia
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Somatosensory systems
Where your body is, what its state is
 Proprioception
 Mechanical receptors
 Chemoreceptors
 Thermoreceptors
 Nociceptors
 Wired contralaterally
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Ascending spinal thalamic tract
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Dorsal column medial lemniscal pathway
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Pain and temperature
Goes through medial lemniscus to medula ->
pons -> midbrain -> thalamus -> cortex
So again, the thalamus is a sensory
clearinghouse or switchboard or whatever
Somatosensory cortex
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Parietal
Can look at it with a
sensory homunculus
So much more
sensory data from
more enervated
areas, so more
cortical processing
power needed
Chemical senses
Is taste the five types of basic tastes, or is
it a pattern?
 Fine question….
 Cranial nerves to brainstem (medulla)
 Evolutionarily sensible
 Smell does not go to the thalamus!
 Goes to the olfactory bulb
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Goes to the limbic system, amygdila and
Hp
 Smell and emotion?
 Well many people say this
 There is not a whole bunch of data
 Smell disorders do happen though
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Vision
Basically, it all goes to V1 – V5 in occipital
lobe
 Won’t dwell on this as we did lots last term
 Book does a decent job anyway
 Blindsight
 Neglect
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Audition
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Hairlike receptors to
detect frequency
Temporal lobe
Heschl’s gyrus
Frequency bands
Not quite as rigid as
the visual system but
some bands are more
sensitive to certain
frequencies
Speech and lingo
Heschl’s -> Wernicke’s
 Makes sense of speech
 Now other cortical areas are needed to
interpret meaning
 Wernicke’s aphasia
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Left meaning
 Right, intent
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Broca’s for speaking
This is cool
People that use ASL as their first language
use Broca’s and Wernicke’s as we do!
 So they are not necessarily for say
auditory processing
 They are for language
 Only we have ‘em
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Motor systems
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Primary motor does
fine detail of
movement
Secondary motor
does organization and
timing of movement
Disocciable
Cingulate motor area
P300
Subcortical motor processing
Basal ganglia and cerebellum, automatic
 Parkinson’s disease and substantia negra
of the basal ganglia
 Huntington’s affects the cuadate, jerky
movement
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conclusions
This is just a taste
 This stuff is very complex
 May be where ‘consciousness’ comes
from
 Disorders are possible, more on that later
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