eyes roll slowly from side to side, low frequency, high amplitude waves
stage 3 sleep
large amplitude delta waves sweep the brain every second
stage 4 sleep
deepest sleep, difficult to waken a sleeper. large regular delta waves occuring more than 50 percent of the time.
the appearance of things relative to one another as determined by their distance from the viewer
describing one kind of sensation in terms of another ("a loud color", "a sweet sound")
A measure of how high or low a sound is perceived to be, depending on the frequency of the sound wave
hearing loss caused by damage to the mechanical system that conducts sound waves to the cochlea
hearing loss caused by damage to the inner ear
gate control theory
theory that spinal cord contains neurological gate that blocks pains signals or allows them to pass. gate is opened by activity of pain going up small nerve fibers & gate is closed by act of large fibers or by info coming from brain
eyeball is too long, so objects are focused at a point slightly in front of the retina. you can see objects that are near but distant objects seem blurry.
eyeball is too short, so objects are focused at a poitn slightly behind the retina so that you can see distant objects clearly but near objects appear blurry.