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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 Somatosensory systems Where your body is, what its state is Proprioception Mechanical receptors Chemoreceptors Thermoreceptors Nociceptors Wired contralaterally Ascending spinal thalamic tract Dorsal column medial lemniscal pathway 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 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 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 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 Audition 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 Left meaning Right, intent 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 Motor systems 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 conclusions This is just a taste This stuff is very complex May be where ‘consciousness’ comes from Disorders are possible, more on that later