1. Early Infant Monocular Vision

Question 1

At what age do infants tend to reach for objects presented in the visual field

Answer 1

3 weeks tend to POORLY reach for objects

-reach but don’t open hands fast enough

Question 2

At what age do infants start reaching more accurately

Answer 2

4-5 months

Question 3

What is the withdrawel reflex response based on?

Answer 3

1. enlarging or looming target
   - konio cells respond to growing objects
2. dynamic stereoscopic changes
   - opposite directional movement of the 2 eyes impacts this response

Question 4

At what age do babies look in the same direction as the person they are looking at

Answer 4

11 months

Question 5

What can babies see when they are

1 week, 1 month, 2 months, 6 months

Answer 5

1 week: low contrast, blurry, difficult to recognize objects w/o movement
1 month: some improvement, but identification is still difficult w/o movement
2 month: can identify image w/o movement, but just faintly
6 month: image can be identified relatively easily w/o movement

Question 6

at what age do kittens respond to light?

Answer 6

3 weeks of age

Question 7

at what age will kittens prefer a closer table and have a sense of depth?

Answer 7

4 weeks of age

Question 8

when do neuromodulators start working in humans?

Answer 8

5.5 weeks after birth

Question 9

What neurotransmitters cause behaviors in infants to start at 3.5 and 4.5 weeks?

Answer 9

Tunica, Norepeinephrine, GABA inhibition