sensory w5 Flashcards
Chemoreceptor
Detect molecules
Eg olfaction and taste
Mechanoreceptors
Physical distortion: change in stimuli, pressure, touch, hearing, position (vestibular), muscle strength
Electromagnetic receptors
Visible light (human vision) - radiation
Magnetic field (not in human)
Thermoreceptors
Change in temp
Pain receptors - nociceptor
Severe heat and pressure
= mechan + thermo
Information relayed through modality-specific pathway, EXCEPT
(OLFACTORY STRAIGHT TO CORTEX, AND VISION STRAIGHT TO THALAMUS)
TRANSDUCTION
convert whatever input into electrical response
topographically arrange
vision retinotopic
audiotory tonotopic
somatosensory (humuculus) somatopic
taste and olfactory NO
receptors density vs acuity
more receptors -> greater acuity
olfactory function
go straight cortex
feeding behaviour, homeosasis, satiety
lateral inhibition for?
sharpening detection of input (only keep the strongest)
thalamus
filtering information, only keep what is novel (eg you dont feel clothes touching your skin all day)
primary level cortex function + damage
receive raw information
-> damage lost raw information
secondary level function + damage
secondary level - unimodal area
analyse (one modal only)
eg meaning of sound, smell, is this familar, what that’s mean
third level function + damage
integration
analyse, integrate various input + cognifive function ( we dont experience only one at a time)
-> damage = lost ability to integrate => hear but cannot use that to communicate, see the road but cannot design how to walk
unconcious sensation (subconcious)
not perceived in the cortex
visceral sensory
reflexes
automatic movement
spinaocerrebella pathway: proprio to cerebellum
taste pathway
- bind to microvilli of taste cell
synapse cell body in ganglia 7 9 10 - concious through thalamus
- unconcious to brainstem hypothalamus for food hunger, satiety
topographically arrange
vision retinotopic
audiotory tonotopic
somatosensory (humuculus) somatopic
taste and olfactory NO
