Chapter 4 pt. 1 Flashcards Preview

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Flashcards in Chapter 4 pt. 1 Deck (31):
1

Vision is basically your eyes absorbing _____

light

2

The danger of radiation is dependent of its __________

properties

3

True or False: not all radiation is dangerous

True

4

Light is ___________ radiation, it travels in waves.

electromagnetic

5

Light is electromagnetic radiation, it travels in ______.

waves

6

Amplitude or Wavelength: the height of a light wave

amplitude

7

Amplitude or Wavelength: the brightness of light

amplitude

8

Amplitude or Wavelength: distance between peaks in light

wavelength

9

Amplitude or Wavelength: Hue the color of the light

wavelength

10

True or False: when it comes to light, the longer the wavelength the more dangerous it is

False, the shorter the wavelength the more dangerous it is

11

True or False: the shorter the wavelength the more dangerous it is

True

12

different wavelengths added together

purity

13

The eye houses the _____ and channels light toward it

retina

14

How does light enter the eye?

1. light enters your eye then...
2. ...to lens: focuses the light on the retina (back of the eye)...
3. …past the ciliary muscles...
4. …axons bundle together to form optic nerve, which goes to the brain...

15

ring of muscle in the eye

iris

16

______ size regulates the amount of light

pupil

17

pupil size regulates the amount of ______

light

18

the back of your eye that has cones

fovea

19

How does nearsightedness occur?

- the focus of light from distant objects falls a little short of the retina
- the eye is elongated, like an oval, so the image does not quite reach the retina (naturally)

20

How does farsightedness occur?

-The focus of light from close objects falls behind the retina.
- eye is like a squished circle

21

the retina contains two types of receptors, _____ and ______

rods
cones

22

Rods or cones: night vision (sensitive dim light)

rods

23

Rods or cones: faster dark adaptation

rods

24

Rods or cones: daylight vision and color vision (provide sharpness and detail in bright light)

cones

25

Rods or cones: focused in fovea

cones

26

Does your eye have more rods or cones?

rods

27

How do visuals travel through the brain?

1. Retina
2. Optic Chiasm
3. Lateral geniculate nucleus (LGN)
4. Superior colliculus
5. Visual Cortex

28

Explain the Trichromatic Theory.

We perceive color by comparing the responses of three types of cones,
- each of which is sensitive to a different part of the range of visible wavelengths (e.g. short, medium, or long)

29

Why does color blindness occur?

Usually only one or two types of color receptors are faulty – most commonly red & green

30

Many people with color blindness still see what colors?

blue and yellow

31

How does the Trichromatic help explain color blindness?

Since color blindness has to do with faulty color receptors, trichromatic theory suggests each cone has a different set of sensitivity.
Suggesting color blindness has to do with either too much or too little visible wavelengths. Or the fault may be due to sensitivity.