Visual development

Question 1

Describe visual cortex

Answer 1

Axons from retina grow to thalamus where they form synapses with neurones there
Axons grow to visual cortex made of columns of cells ( adjacent columns receive stimulation from same area in right or left eye)

Question 2

Describe case study of baby monkeys

Answer 2

Some baby monkeys raised in dark for 3-6months
Some raised in light but with exposed to no pattern
When return to normal visual both groupd had difficulty with object discrimination and pattern recognition
Supports crticial period as both were denied vision

Question 3

Describe Hubek and Wiesel

Answer 3

Deprived baby monkeys of light in one eye
After 6 months exposed to light but monkey blind in light deprived eye
Deprivation in adults had no effect
Critical period in early life for vision to develop properly

Question 4

Describe cataracts in young and old people

Answer 4

If not removed by 10 child has permanent impairment of perception
Elderly regain normally vision