Quiz
Week 5
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Questions in this quiz (26)
1[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'.- ALight
- BParticles
- CRays
- DLight
- EParticles
- FRays
- GLight
- HParticles
- IRays
2[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- ACornea
- BPupil
- CLens
- DRetina
- EAqueous/Vitreous Humour
3Transduction occurs when:
- ALight enters the pupil
- BLight hits the retina
- CThe retina sends the image to the Optic Nerve
- DThe lens is in focus
4Recombining rays from various directions to form a single point on the imaging surface is known as:
- AFocusing
- BRefracting
- CAccommodation
- DTransduction
5Focusing is the job of the:
- ACornea
- BPupil
- CLens
- DRetina
6The [blank_start]cornea[blank_end] refracts light at a constant amount.
The [blank_start]lens[blank_end] refracts light by a variable amount.- Acornea
- Blens
- Ccornea
- Dlens
7[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- AEmmetropia
- BMyopia
- CHyperopia/Hypermetropia
- DPresbyopia
- EAstigmatism
8Which of the following is true for myopia:
- AFocal length is too short
- BLight is focused behind the retina
- CNeed concave corrective lenses
- DOccurs with old age
9Rods: [blank_start]high[blank_end] sensitivity; [blank_start]night vision[blank_end]
Cones: [blank_start]lower[blank_end] sensitivity; [blank_start]daytime[blank_end]- Ahigh
- Blow
- Cdaytime
- Dnight vision
- Ehigh
- Flow
- Gdaytime
- Hnight vision
10[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.
- ARods
- Bcones
- Cganglion
- Dbipolar
- Eamacrine
- Fhorizontal
- Gaxons
- Hoptic nerve
- Iphotoreceptors
11There are many photoreceptors in the optic disk.
- ATrue
- BFalse
12Receptive fields for foveal vision are:
- ASmaller
- BLarger
- CDensely packed
- DSparsely packed
13Retinal ganglion cell axons terminate in the
- ALateral Genicular Nucleus
- BOptic Nerve
- CVitreous Humour
- DOccipital Lobe
14Properties of OFF Centre cells:
- ALight on the inner portion causes a decrease in ganglion cell activity
- BTell us how bright an area is
- CHelp detect local luminance decrements
- DCancel out the effect of ON Centre cells
15Having both OFF and ON Centre cells makes it more difficult to go below the spontaneous firing rate.
- ATrue
- BFalse
16Layers [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.- A1
- B4
- C6
- D2
- E3
- F5
17Magnocellular 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]- Alarge
- Bfast
- Chigh
- Dmotion
- Esmall
- Fslow
- Glow
- Hcolour
18The majority of the focusing power in the eyes comes from the lens
- ATrue
- BFalse
19High pressure of the aqueous humour can cause:
- AGlaucoma
- BRetinal damage
- CBlindness
- DMyopia
20When our pupils constrict, our depth of focus [blank_start]increases[blank_end].
- Aincreases
- Bdecreases
21[blank_start]Horizontal[blank_end] Cells: receptors synapse with bipolar cells
[blank_start]Amacrine[blank_end] Cells: bipolar cells synapse with ganglion cells- AAmacrine
- BHorizontal
- CAmacrine
- DHorizontal
22When 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].
- Ascotopic
- Bphotopic
- Cmesopic
23Axons from the [blank_start]temporal[blank_end] side of the retina don't crossover at the optic chiasm.
- Anasal
- Btemporal
24How many layers does each LGN have?
- A6 - 2 magnocellular & 4 parvocellular
- B4 - 2 magnocellular & 2 parvocellular
- C6 - 4 magnocellular & 2 parvocelluolar
- D4 - 2 contralateral and 2 ipsilateral in each
25OFF Centre cells are sombrero shaped
- ATrue
- BFalse
26Ganglion Cells:
- AOnly signal the 'edges' in patters
- BRespond to absolute rates of intensity
- CNothing changes when the overall level of illumination goes up or down
- DHave antagonistic receptive fields
- EThe surrounding area does the same job as the centre of the cell
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- 2 Perception (Week 5 - Light, Eye, and the Brain) Quiz on Week 5, created by Eloise C on 15/04/2017.
- Author
- Eloise C
- Language
- English
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