Vision and perception Flashcards
What is the difference between sensation and perception?
sensation is receiving sensory information from the environment through senses and translating it into electrical signals whereas perception is the interpretation of the sensory information and the process of assigning it meaning. sensation and perception may have a delay in them
what are the three stages of general neural implementation?
- sensory organs absorb energy
- energy is transduced into a neural signal
- neural signal is sent into the brain where processing takes place
what range can humans detect from and which colour has the longest and shortest wavelegnths
400-750nm. red has the longest, blue has the shortest
What is the function of the cornea?
focus image onto rods and cones at back of eye. kept alive by liquid in the anterior chamber as no blood vessels go into it
what does the middle part of the eye contain?
the choroid and the anterior chamber
what is the function of the choriod and what is it?
a layer of blood vessels that gives nutrients to the eye and removes waste from the anterior chamber
what does the inner eye contain?
vitrueous humor, iris, pupil, lens and retina
what is the vitreous humor and its function?
gives nutrients to everywhere the choroid doesn’t reach. inside the eye behind the lens
what is the structure and function of the iris?
muscular pigmented tissue that goes through the anterior chamber to the iris and will expand/contract to allow different levels of light into the pupil. attached to ciliary body
what is the critical period of the lens?
during the critical period must keep information flowing through to maintain vision. critical period occurs when first born or after injury.
what is cataracts and how can it be fixed?
when lens gets cloudy with age and fixed by removing and replacing with new lens.
what is accommodation?
changing shape of the lens for focussing.
what is the purpose of the retina?
transduces electrical energy from the lightrays into chemical energy into the optical nerve
what are cones and where are they located?
the light sensing colour photoreceptors that are mainly located on the retina in the fovea at the back of the eyeball (7 million)
what are rods and where are they located?
no colour and low resolution. starts AFTER the fovea as there are none in it (light doesnt get through straight away). 120 million of them
what is the frontal lobe specialized for?
executive planning and execution
what is the parietal lobe mainly for?
sensory system processing, spacial and motion awareness, attention and perception of objects
what is the occipital lobe for?
VISION and is the only one with only one purpose
what is the temporal lobe for?
has a variety of functions including vision, memory and sensory information