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Development of Vision (Spatial Vision (Vernier acuity (16 weeks+, Vernier…
Development of Vision
Spatial Vision
Standard acuity
Optics of the eye
Contrast sensitivity function (CSF)
Spatial frequency
Baby's shit at low and medium frequencies
Vernier acuity
16 weeks+, Vernier acuity > Standard acuity
Striate Cortex
Displacement of line
Feature detection
Measure orientation recognition with VEPs
Until 6 weeks- only respond the phase changes
Motion
'Odd-man out'- 12 weeks
'Looming'- Very young
Colour
Blue from 1 month
Basically in place from birth
Depth/Stereopsis
Eleanor Gibson
- Baby and box depth experiment
Visual system overrides 'feeling'
Random dot stereogram- 4-6 months
Face Perception
Perceptual narrowing
Monkeys vs humans
6 months vs 10 months
Measuring baby vision
Preferential looking
Acuity and contrast
Optotype cards
Acuity
Thumb-sucking
Visually Evoked Potentials (VEPs)
Electrodes on skull
Same image, many times
Problems of Vision
Amblyopia
Blunted vision
Strabismus
Patching
Bad binocular cells
Lazy eye
Age related
Presbyopia
Posterior Vitreous Detachment (PVD)
Age-related Macular Degeneration (AMD)
UV
Case of SB
blind, active
Could not cross traffic with eyes
Not suprised
Selective rearing
(Deprivation studies)
Active exploration
Kitty carousel
Poor depth perception
Critical Periods
Cells not stimulated= No growth