Lecture 11 Color Vision
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24 Terms
Absolute thresholds reach adult levels when?
about 6 months after birth
Spatial summation areas comparison between infants and adults?
bigger in infants
Infant increment threshold functions comparison to adults?
similar to adults--obey Weber's Law by 2-4 months of age
how to determine absolute threshold in infants?
the level of light they can detect with dark adapted infant
Spatial summation graph plots what vs what?
log stimulus vs log threshold
Spatial summation shows what about absolute threshold ?
absolute threshold is constant over large range of stimulus areas
Increment threshold functions plot what vs what?
log background luminance vs log threshold
Increment threshold function comparison between infants and adults
similar in terms of slope
Weber's Law is when ...
slope=1 (true in adults and infants by 2-4 months)
Among luminous efficiency, dark adaptation, vernier acuity, grating acuity, peak of CS, absolute threshold --- which ones take over 2 years to fully develop?
grating acuity
vernier acuity
Problem with HRR test for color vision?
may recognize based on brightness, not actually color
When measuring color vision in infants, need to ensure what?
that they are responding to differences in wavelength rather than differences in luminance of the stimuli
Infants show dichromatic color vision by when?
8-10 weeks
When do infants have functional medium and long wavelength sensitive cones ? (green and red)
2 weeks of age
When do short wavelength/blue cones become functional in infants?
5 weeks
VEP
- achromatic pathway vs chromatic pathway development by when?
12-15 weeks
vs.
12-14 yrs old
For VEP in deutan infant, which cones show reduced response?
L-M cones
When are rods/one cone type functional by?
1 month
Infants show dichromatic color vision by when?
8-10 weeks
Trichromatic vision presents by when?
3 months
4 types of color vision tests
HRR
Color Vision Testing Made Easy
Portnoy Plates
F2 plates
Do males or females fail color vision testing more frequently? which race?
white males
MassArray Assay does what?
opsin gene analysis providing genetic information that can be useful in the diagnosis of inherited color vision deficiency
Ricco's Law holds for what?
spatial summation and only holds within critical area