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Terms_Part_II_sp_08_1 - Terms Part II Scroll down for most...

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Terms Part II Scroll down for most recent terms! You are not responsible for anything in tiny (10pt) font. Sensory Physiology (lab 26) Be able to name what you were testing with each activity…and know the following: Vision (photoreceptors); receptors in eye (retina) Photopupillary (pupillary light) response : rapid adjustment of pupil size in response to light intensity (low light=larger pupil diameter; high light=smaller pupil diameter) Convergence Response (near point reaction): pupil and eyeball adjustment as objects move closer Near Point Accommodation : adjustment of eye to focus on near objects ( how? lens gets thicker and rounder when objects are closer) Near point : shortest distance before object becomes blurry lens loses elasticity with age…therefore near point distance becomes greater for people over 40 Blind spot : lack of photoreceptors at optic disc Afterimage : continue to see bright image in field of vision after looking away from object know the difference between stimulus cause and physiological cause of positive vs. negative Positive afterimage : caused by brief exposure to bright light; due to continued firing of photoreceptors for brief time Negative afterimage : caused by prolonged exposure to image; due to bleaching of photoreceptors (see black instead of white and vice versa or color images in complementary colors) Myopic : near-sighted; poor far vision; eyeball usu. too long (20/>20) Hyperopic : farsighted; poor near vision; eyeball usu. too short (20/<10) Astigmatism : due to asymmetrical irregularities in curvature of cornea or lens Touch (mechanical receptor): receptors distributed throughout body 4 cutaneous sensations: warmth, cold, touch, pain 2-point threshold: minimum distance at which two points of contact can be detected as 2 sep. points Chemoreceptors : Smell: olfactory; receptors in nose Taste: gustatory; receptors on tongue Salty: chemical basis= sodium (front sides of tongue) Sour: chemical basis= H + (back sides of tongue)
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