Exam (elaborations)
Psyc 367 Final Exam Questions And Answers Latest Update
- Course
- Psyc 367
- Institution
- Metro State University
Psyc 367 Final Exam Questions And Answers Latest Update
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Psyc 367 Final Exam 2024-2025Questions And Answers Latest Update
Explain what is meant by Snellen acuities of 6/6, 6/3, and 6/12. - 6/6 is normal
vision therefore at a distance of 6m you can read a line with 1 minute of arc
6/3 = better, can read at 6 meters what a person at 3 can
6/12=worse, can read at 6 meters what a person at 12 can
Distinguish between recognition and resolution acuity, and list 3 stimuli that can
be used to measure each type of acuity. - recognition acuity: smallest target
letter, number or shape that can be identified
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,1)letters
2)numbers
3)pictures
resolution acuity: smallest gap in a C or E that can be located or finest grating that
can be resolved
1)Landolt's C
2)Tumbling E's
3)Grating acuity
Describe how photoreceptor properties and scotopic/photopic vision affect visual
acuity. - Resolution acuity relies on the photoreceptor properties of density and
convergence.
In Photopic is best because cones as there are closer together 0.5 minutes of arc
and less convergence (1 cone per photoreceptor)
In scotopic we are using rods therefore cannot tell fine details b/c
1)Rods are farther apart (0.75 minutes of arc)
2)Convergence of photoreceptors onto retinal ganglion cells
phase - position of a grating relative to some landmark
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, contrast - description of the intensity difference between the light and dark bars
of a grating
spatial frequency - number of cycles (one black and one white bar) of a grating in
1 degree of visual angle
recognition acuity - smallest target letter, number or shape that can be identified
resolution acuity - smallest gap in a C or E that can be located or finest grating
that can be resolved
visual acuity - the ability of the visual system to resolve fine spatial detail
Draw and label a typical contrast sensitivity function (CSF). -
Describe how optical, anatomical, physiological, experimental design, and age
factors affect the shape of the CSF. - high frequency:
optical= eye limitations as thinner bars can't be define as well on the retina
anatomy: due to the spacing between the cones
low frequency:
physiological: fewer neurons are tuned for low spatial frequencies
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