Lab exam: Special Senses Flashcards
what are modalities
are natural stimulus for a sensory receptor
ex) sound, light, chemical, temperature)
* a type of stimulus
temperature apdation
is how we adapt to temperature
ex) getting into a hot tub- overtime you adapt. and then jumping into a pool its cold
how is determining the density of touch receptors
determined by distance (mechanorecptors involved in sensing touch)
- the modality is pressure
small distance= higher area of receptors
ability to localize a stimulus
high density has a precise location
relationship between density of touch receptors and cotexes
high density: larger area in the cortex
low density: small area in the cortex
referred pain
when you may feel pain in one area but the actual source of the pain is located somewhere different. (common with internal organs)
parts of the eye that refract light
cornea, vitreous, lens
cornea: binds the light
lens: adjusts the binding
( thicker the lends–>more it will binds
accommodation
ability of the lens to thicken and focus on near objects ( important to see near objects)
how does the lens of the eye alter its refraction strength
by relaxing ligaments–> higher refraction stretched out to get thinner)
Myopia
near sighted. light rays converge in front of the retina and the individual will not clearly see objects far away.
( eyeball too long)
hyperopia
far sighted, light rays converge behind the retina and the person cannot clearly see objects close up
( eyeball being to short)
emmertropia
normal vision which occurs when the light rays converge on the retina
astigmastism
is an irregular curvature of cornea
presbyopia
stiffening of the lens with age
- lens can no longer thicken or bulge enough to focus on near objects and near point of vision moves outward
process of phototrasolution
process of converting light energy into electrical energy (AP) send nerve signals to the brain
