Sensory Nervous System (EYES) Flashcards
perception
identifying, organising + interpreting sensory info
teleception
far away sensory
- hearing
- sight
- smell (olfactory)
exteroception
direct contact
- skin
- pain
- taste (gustatory)
proprioception
self movement
interoception
internal state of body
brain parts for sight
- parietal lobe
- occipital lobe
- temporal lobe
4 functions of sight
- qualitative
- quantitative
- temporal
- spatial
pupils constrict when
- light change (brighter lights)
- accommodation (object from far away comes closer)
retina what does it do
- innermost part of the eye
- sees things inverted
process of sight
- photoreceptors
- bipolar cells
- ganglion cells
- optic nerve
blind spot
- area you can’t see because there aren’t any rods or cones
2 photoreceptors
- rods
- cones
rods definition
light receptors
- highly sensitive
- use rhodopsin (violet)
cones definition
colour receptors
different colour receptors in cones
- L cones ; red
- M cones; green
- S cones; blue
partial decussation
optic nerve fibres cross
photopic vision
vision in well-lit places
- done by cones
- high visual acuity
- high temporal resolution
scotopic vision
vision in dark places
- done by rods
- low visual acuity
- low temporal resolution
Purkinje effect
rods can only perceive blue light so reds appear darker
accommodation process
optical power change to keep clear focus on object with ciliary body
depth perception
seeing things in 3d
physiological nystagmus
involuntary, jerky eye movement
myopia
light focuses in front of retina
far sightedness
light focuses behind retina
cataract
cloudy area in lens that blurs vision
