Human Factors Engineering -- Exam #2
UPDATED ACTUAL Exam Questions and
CORRECT Answers
color perception - CORRECT ANSWER - determined by the wavelength of light reflected
from or emitted by an object
perception of color - CORRECT ANSWER - is purely psychological (wavelengths are
physical)
hue - CORRECT ANSWER - variations described by names such as red, purple, blue,
orange, etc
saturation - CORRECT ANSWER - apparent purity, vividness, or richness
lightness - CORRECT ANSWER - dark to light
trichromatic theory - CORRECT ANSWER - - human color vision is trichromatic
- there are three types of photoreceptors corresponding to blue, green, and red
- supported by the fact that there are three types of cones in the retina
colorblindness - CORRECT ANSWER - type one: dichromats
type two: two types of cones that work normally, one type that works weakly
how common is colorblindness? - CORRECT ANSWER - 1/12 men and 1/200 women
what colors are most affected with colorblindness? - CORRECT ANSWER - red and green
, opponent process theory - CORRECT ANSWER - color perception is controlled by the
activity of two opponent systems (blue-yellow and red-green); only one color can be signaled at
a time
opponent process theory (2) - CORRECT ANSWER - staring a red image produces a
green afterimage
why do colors matter in HF? - CORRECT ANSWER - - many systems convey information
via color
- we must create/evaluate displays based on how people perceive color
- displays can be useable or unuseable by people with colorblindness
how to accommodate colorblindness - CORRECT ANSWER - - select colors carefully
- test color display works for common colorblindness
- use redundant coding (using codes other than colors to convey information)
visual acuity - CORRECT ANSWER - clearness or sharpness of vision (usually measured
by Snellen Eye Chart)
contrast sensitivity - CORRECT ANSWER - the ability of the VISUAL SYSTEM to
distinguish bright and dim components of a static image (function of both contrast and spatial
frequency); declines with age
what do we see? - CORRECT ANSWER - what our eyes take in is distinct from what we
actually perceive; our brain has to organize the information we gather
perceptual organization - CORRECT ANSWER - the process by which we figure out the
relationships among potentially separate stimulus elements
Figure v. Ground - CORRECT ANSWER - how we perceive objects and background
UPDATED ACTUAL Exam Questions and
CORRECT Answers
color perception - CORRECT ANSWER - determined by the wavelength of light reflected
from or emitted by an object
perception of color - CORRECT ANSWER - is purely psychological (wavelengths are
physical)
hue - CORRECT ANSWER - variations described by names such as red, purple, blue,
orange, etc
saturation - CORRECT ANSWER - apparent purity, vividness, or richness
lightness - CORRECT ANSWER - dark to light
trichromatic theory - CORRECT ANSWER - - human color vision is trichromatic
- there are three types of photoreceptors corresponding to blue, green, and red
- supported by the fact that there are three types of cones in the retina
colorblindness - CORRECT ANSWER - type one: dichromats
type two: two types of cones that work normally, one type that works weakly
how common is colorblindness? - CORRECT ANSWER - 1/12 men and 1/200 women
what colors are most affected with colorblindness? - CORRECT ANSWER - red and green
, opponent process theory - CORRECT ANSWER - color perception is controlled by the
activity of two opponent systems (blue-yellow and red-green); only one color can be signaled at
a time
opponent process theory (2) - CORRECT ANSWER - staring a red image produces a
green afterimage
why do colors matter in HF? - CORRECT ANSWER - - many systems convey information
via color
- we must create/evaluate displays based on how people perceive color
- displays can be useable or unuseable by people with colorblindness
how to accommodate colorblindness - CORRECT ANSWER - - select colors carefully
- test color display works for common colorblindness
- use redundant coding (using codes other than colors to convey information)
visual acuity - CORRECT ANSWER - clearness or sharpness of vision (usually measured
by Snellen Eye Chart)
contrast sensitivity - CORRECT ANSWER - the ability of the VISUAL SYSTEM to
distinguish bright and dim components of a static image (function of both contrast and spatial
frequency); declines with age
what do we see? - CORRECT ANSWER - what our eyes take in is distinct from what we
actually perceive; our brain has to organize the information we gather
perceptual organization - CORRECT ANSWER - the process by which we figure out the
relationships among potentially separate stimulus elements
Figure v. Ground - CORRECT ANSWER - how we perceive objects and background
