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Flashcards in 4.2 Deck (26):
1

What strikes our eyes is not color....

But pulses of electromagnetic energy that our visual system perceives as color

2

Wavelength

The distance from the peak of one light or sound wave to the peak of the next. Electromagnetic wavelengths vary from the short blips of cosmic rays to the long pulses of radio transmission

3

Hue

The dimension of color that is determined by the wavelength of light; what we know as the color names, blue, green, and so forth

4

Intensity

The amount of energy in a light or sound wave, which we perceive as brightness or loudness, as determined by the wave's amplitude

5

Cornea

Protects the eye and bends light to provide focus

6

Pupil

The adjustable opening in the center of the eye through which light enters

7

Iris

A ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening

8

Lens

The transparent structure behind the pupil that changes shape to help focus images on the retina

9

Retina

The light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information

10

Accommodation

The process by which the eye's lens change shape to focus near or far objects on the retina

11

The retina doesn't....

"See" a whole image

12

Rods

Retinal receptors that vets the black, white, and gray; necessary for peripheral and twilight vision, when comes don't respond

13

Cones

Retinal receptor cells that are concentrated near the center of the retina and that function in daylight or in well-lit conditions. The cones detect fine detail and give rise to color sensations

14

Optic nerve

The nerve that carries neural impulses from the eye to the brain

15

Blind spot

The point at which the optic nerve leaves the eye creating a "blind" apt because no receptor cells are located there

16

Fovea

The central vocal pony in the retina, around which the eye cones cluster

17

Bipolar cells help....

Relay the cone's individual message to the visual cortex

18

Cones enable you to...

See color

19

Rods enable....

Black and which vision

20

You eye responds to pressure as....

Light

21

Feature detectors

Nerve cells in the brain that respond to specific features of the stimulus, such as shape, angle, or movement

22

Parallel processing

The processing of many aspects of a problem simultaneously; the brain's natural mode of information processing for many functions, including vision. Contrasts with the step by step processing of most computers and conscious problem solving

23

Blightsight

A localized area of blindness in their field of vision

24

Young-helmholtz trichromatic (three-color) theory

The theory that the retina contains three different color receptors- one most sensitive to red, one to green, one to blue-which, when stimulated on combination, can produce the perfection of any color

25

Opponent-process theory

The theory that opposing retinal processes (red-green, yellow- blue, white-black) enable color vision. For example some cells are stimulated by green and inhibited by red and vice versa

26

Transduction

Conversion from one form of energy into another. In sensation, the transforming of stimulus energies, such as sights, sounds, and smells, into neural impulses our brain can