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PSYC 1
CH7/CH8: Sensation, Perception, Vison
21
Psychology
Undergraduate 4
10/22/2007

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Cards

Term
sensation (what is it)
Definition
physiological: how nervous system deals with info,meaningless
Term
perception
Definition
psychological, meaningful
Term
chain of sensation
Definition

1. physical stimulus impinges on organism

2. Physiological response to physical stimulus

3. sensory experience 

Term
physical stimulus for vision
Definition

visible light!

-electromagnetic radiation with wavelengths between  400nm-700nm, different wavelengths, different colors 

Term
structures of eye (5)
Definition
cornea, pupil, iris, lens, retina
Term
cornea
Definition

thin film that covers and protects eye

also focuses light (most of focusing) 

Term
pupil
Definition
hole in your eye that lets light in
Term
iris
Definition

muscle that makes the pupil bigger or smaller,

gives eye its color 

Term
lens
Definition
focuses light more, changes shape to adjust focal length, with age lens hardens
Term
retina
Definition

photographic film of your eye

function: detect light, and then send info to brain about light 

Term
photoceptors, cause what?
Definition
light sensitive cells
Term
transduction
Definition
conversion of physical energy into neural signal
Term
2 kinds of photoceptors?
Definition
rods (permit vision in diml light), cones (permits sharply focused color vision in bright light)
Term
photochemical
Definition
molecule that changtes its geometry in response to light energy
Term
blindspot
Definition
due to the absence of receptor cells, no photoreceptors on optic disc, on 2 pts of visual field
Term
why called rods? photochemical? sensitivity to light? visual acuity?
Definition

because of vylindrical shape,  ability to see in very dim light

rhodopsin

so sensitive to light they get saturated at hgiher light levels

have poor visual acuity--> greater neural convergence 

Term
why called cones? photochemical? saturated? # of kinds? responsible for what? neural convergence?
Definition
because of shape called cones, photochemical much less sensitive to lgiht, don't get saturated in bright light, 3 kinds, responsible for color vision, have good visual acuity, less neural convergence
Term
fovea, rods or cones here?
Definition
center of retina, where light hits coming from object you're looking at/being fixated, only concentrated cones here,
Term
periphery, rods or cones here?
Definition
retina outside fovea, stuff outside focus point that is blurry/unseen because where light is hitting there are no cones receiving it in your eye, rods evenly here, no cones
Term
color vision, dimensional (physically v. psychologically?)
Definition
physically color is unidimensional, psychologically its multidimensional
Term
additive color mixing
Definition

three primaries law:  the color sensed from any single wavelength can always be matched by mixing together three other different wavelengths

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