Week 5

Description

2 Perception (Week 5 - Light, Eye, and the Brain) Quiz on Week 5, created by Eloise C on 15/04/2017.
Eloise C
Quiz by Eloise C, updated more than 1 year ago
Eloise C
Created by Eloise C over 7 years ago
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Resource summary

Question 1

Question
[blank_start]Light[blank_end]: waves of electromagnetic radiation. [blank_start]Rays[blank_end]: travels in straight lines at a constant, very high speed [blank_start]Particles[blank_end]: discrete packets or 'quanta'.
Answer
  • Light
  • Particles
  • Rays
  • Light
  • Particles
  • Rays
  • Light
  • Particles
  • Rays

Question 2

Question
[blank_start]Cornea[blank_end]: transparent window into the eyeball. [blank_start]Pupil[blank_end]: dark, circular opening at the centre of the iris, where light enters the eye [blank_start]Lens[blank_end]: enables changing focus using ciliary muscles [blank_start]Retina[blank_end]: light-sensitive membrane in the back of the eye that contains rods and cones, which receive an image from the lens and send it back to the brain through the Optic Nerve. [blank_start]Aqueous/Vitreous Humour[blank_end]: squishy bits
Answer
  • Cornea
  • Pupil
  • Lens
  • Retina
  • Aqueous/Vitreous Humour

Question 3

Question
Transduction occurs when:
Answer
  • Light enters the pupil
  • Light hits the retina
  • The retina sends the image to the Optic Nerve
  • The lens is in focus

Question 4

Question
Recombining rays from various directions to form a single point on the imaging surface is known as:
Answer
  • Focusing
  • Refracting
  • Accommodation
  • Transduction

Question 5

Question
Focusing is the job of the:
Answer
  • Cornea
  • Pupil
  • Lens
  • Retina

Question 6

Question
The [blank_start]cornea[blank_end] refracts light at a constant amount. The [blank_start]lens[blank_end] refracts light by a variable amount.
Answer
  • cornea
  • lens
  • cornea
  • lens

Question 7

Question
[blank_start]Emmetropia[blank_end]: normal refractive condition [blank_start]Myopia[blank_end]: short-sightedness [blank_start]Hyperopia/Hypermetropia[blank_end]: long-sightedness [blank_start]Presbyopia[blank_end]: inability to change accommodation [blank_start]Astigmatism[blank_end]: different focal lengths for different orientations
Answer
  • Emmetropia
  • Myopia
  • Hyperopia/Hypermetropia
  • Presbyopia
  • Astigmatism

Question 8

Question
Which of the following is true for myopia:
Answer
  • Focal length is too short
  • Light is focused behind the retina
  • Need concave corrective lenses
  • Occurs with old age

Question 9

Question
Rods: [blank_start]high[blank_end] sensitivity; [blank_start]night vision[blank_end] Cones: [blank_start]lower[blank_end] sensitivity; [blank_start]daytime[blank_end]
Answer
  • high
  • low
  • daytime
  • night vision
  • high
  • low
  • daytime
  • night vision

Question 10

Question
[blank_start]Rods[blank_end] & [blank_start]cones[blank_end] pass electrical impulses to [blank_start]ganglion[blank_end] cells (via [blank_start]bipolar[blank_end]/[blank_start]amacrine[blank_end]/[blank_start]horizontal[blank_end] cells). Ganglion cells have long [blank_start]axons[blank_end] that exit the eyeball via a bundle called the [blank_start]optic nerve[blank_end]. Where the optic nerve leaves the eye, there are no [blank_start]photoreceptors[blank_end] - this is the blind spot.
Answer
  • Rods
  • cones
  • ganglion
  • bipolar
  • amacrine
  • horizontal
  • axons
  • optic nerve
  • photoreceptors

Question 11

Question
There are many photoreceptors in the optic disk.
Answer
  • True
  • False

Question 12

Question
Receptive fields for foveal vision are:
Answer
  • Smaller
  • Larger
  • Densely packed
  • Sparsely packed

Question 13

Question
Retinal ganglion cell axons terminate in the
Answer
  • Lateral Genicular Nucleus
  • Optic Nerve
  • Vitreous Humour
  • Occipital Lobe

Question 14

Question
Properties of OFF Centre cells:
Answer
  • Light on the inner portion causes a decrease in ganglion cell activity
  • Tell us how bright an area is
  • Help detect local luminance decrements
  • Cancel out the effect of ON Centre cells

Question 15

Question
Having both OFF and ON Centre cells makes it more difficult to go below the spontaneous firing rate.
Answer
  • True
  • False

Question 16

Question
Layers [blank_start]1[blank_end], [blank_start]4[blank_end], and [blank_start]6[blank_end] are from the contralateral eye. Layers [blank_start]2[blank_end], [blank_start]3[blank_end], and [blank_start]5[blank_end] are from the ipsilateral eye.
Answer
  • 1
  • 4
  • 6
  • 2
  • 3
  • 5

Question 17

Question
Magnocellular Cells: [blank_start]large[blank_end] RFs, [blank_start]fast[blank_end] response, [blank_start]high[blank_end] sensitivity, process [blank_start]motion[blank_end] Parvocellular Cells: [blank_start]small[blank_end] RFs, [blank_start]low[blank_end] response, [blank_start]low[blank_end] sensitivity, process [blank_start]colour[blank_end]
Answer
  • large
  • fast
  • high
  • motion
  • small
  • slow
  • low
  • colour

Question 18

Question
The majority of the focusing power in the eyes comes from the lens
Answer
  • True
  • False

Question 19

Question
High pressure of the aqueous humour can cause:
Answer
  • Glaucoma
  • Retinal damage
  • Blindness
  • Myopia

Question 20

Question
When our pupils constrict, our depth of focus [blank_start]increases[blank_end].
Answer
  • increases
  • decreases

Question 21

Question
[blank_start]Horizontal[blank_end] Cells: receptors synapse with bipolar cells [blank_start]Amacrine[blank_end] Cells: bipolar cells synapse with ganglion cells
Answer
  • Amacrine
  • Horizontal
  • Amacrine
  • Horizontal

Question 22

Question
When only rods are active, vision is [blank_start]scotopic[blank_end]; when rods cannot function, vision is [blank_start]photopic[blank_end]; when both rods and cones are active, vision is [blank_start]mesopic[blank_end].
Answer
  • scotopic
  • photopic
  • mesopic

Question 23

Question
Axons from the [blank_start]temporal[blank_end] side of the retina don't crossover at the optic chiasm.
Answer
  • nasal
  • temporal

Question 24

Question
How many layers does each LGN have?
Answer
  • 6 - 2 magnocellular & 4 parvocellular
  • 4 - 2 magnocellular & 2 parvocellular
  • 6 - 4 magnocellular & 2 parvocelluolar
  • 4 - 2 contralateral and 2 ipsilateral in each

Question 25

Question
OFF Centre cells are sombrero shaped
Answer
  • True
  • False

Question 26

Question
Ganglion Cells:
Answer
  • Only signal the 'edges' in patters
  • Respond to absolute rates of intensity
  • Nothing changes when the overall level of illumination goes up or down
  • Have antagonistic receptive fields
  • The surrounding area does the same job as the centre of the cell
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