Sensory and Motor Systems

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Sensory and Motor Systems

• Psychology 2617

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Introduction

• The nervous system basically goes sensory -gt
  inter -gt 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
• Pain and temperature
• Dorsal column medial lemniscal pathway
• Goes through medial lemniscus to medula -gt pons
  -gt midbrain -gt thalamus -gt cortex
• So again, the thalamus is a sensory clearinghouse
  or switchboard or whatever

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Somatosensory cortex

• Parietal
• Can look at it with a sensory homunculus
• So much more sensory data from more enervated
  areas, so more cortical processing power needed

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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
• Wont dwell on this as we did lots last term
• Book does a decent job anyway
• Blindsight
• Neglect

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Audition

• Hairlike receptors to detect frequency
• Temporal lobe
• Heschls gyrus
• Frequency bands
• Not quite as rigid as the visual system but some
  bands are more sensitive to certain frequencies

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Speech and lingo

• Heschls -gt Wernickes
• Makes sense of speech
• Now other cortical areas are needed to interpret
  meaning
• Wernickes aphasia
• Left meaning
• Right, intent
• Brocas for speaking

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This is cool

• People that use ASL as their first language use
  Brocas and Wernickes 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

• Primary motor does fine detail of movement
• Secondary motor does organization and timing of
  movement
• Disocciable
• Cingulate motor area
• P300

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Subcortical motor processing

• Basal ganglia and cerebellum, automatic
• Parkinsons disease and substantia negra of the
  basal ganglia
• Huntingtons 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