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developmental final > lifespan perspective of the sensory system > Flashcards

lifespan perspective of the sensory system Flashcards

1
Q

dorsal root ganglion

A

a collection of cell bodies of the afferent sensory fibers

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2
Q

perception

A

integration of sensory impressions into psychologically meaningful information

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3
Q

sensory maps

A

location of sensory receptors in the brain

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4
Q

sensory homunculus

A

shows somatic sensory projections from the body surface

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5
Q

nociceptors

A

pain receptors

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6
Q

somatosensory system function

A

transmit information about the senses to the CNS to regulate behavior

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7
Q

what is the first sensory system to function in utero

A

touch

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8
Q

when can a fetus respond to touch

A

7 weeks

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9
Q

when do muscle spindles form

A

12 weeks in utero

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10
Q

when do golgi tendon organs form

A

16 weeks in utero

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11
Q

when does cutaneous sensation spread to the whole body

A

17 weeks in utero

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12
Q

specific touch localization occurs at what age

A

12-16 months old

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13
Q

when can a child identify objects by touch

A

5 years old

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14
Q

when does two point discrimination occur in a child

A

7 years old

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15
Q

when does proprioceptive acuity for movements improve

A

5-12 years old

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16
Q

when is the sensory system the keenest

A

late adolescence into early adulthood

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17
Q

what % does reaction time slow down in middle adulthood

A

20%

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18
Q

what can affect the ability of joint receptors to detect motion

A

arthritic changes

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19
Q

what is in control of posture, locomotion, balance, and hand function

A

vision

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20
Q

saccades

A

quick simultaneous movement of both eyes in the same direction

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21
Q

slow pursuit/tracking

A

slow smooth eye movements to closely follow a moving object

22
Q

vesibulo-ocular reflex (VOR)

A

moving head side to side but keeping eyes in one spot

23
Q

vergence

A

moving the eyes simulations in different directions

tracking an object coming to your nose (convergence) vs going away from nose (divergence)

24
Q

when do eyes form

A

4 weeks in utero

25
Q

when does myelination begin

A

13 weeks in utero

26
Q

when is reflexive blinking

A

6 months of gestation

27
Q

what is the visual acuity at birth

A

20/800

28
Q

what is the best distance for fixation in newborns

A

7-9 inches

29
Q

what colors are seen at 2 months

A

red and yellow

30
Q

when does preference for a colored object occur

A

3 months

31
Q

when does full color vision occur

A

4 months

32
Q

when does binocular vision begin maturing and when is adult-like vision developed

A

3-5 months
2 years

33
Q

when is 20/20 vision achieved by

A

12 months

34
Q

when are adult levels of depth perception achieved

A

12

35
Q

when does rapid decline of the visual system occur

A

60-80

36
Q

when does vision stabilize

A

40s and 50s

37
Q

when do cataracts begin to form

A

over 30

38
Q

presbyopia develops at age ___

A

45

39
Q

decline in the ability to adapt from light to dark environments

A

40

40
Q

what % of adults over 65 have cataracts

A

60%

41
Q

what % of adults over 75 have macular degeneration

A

28%

42
Q

when do vestibular structures begin thickening in utero

A

week 4

43
Q

when is the vestibular system completely myelinated

A

birth

44
Q

when is the vestibular ocular reflex present by

A

2 months

45
Q

when is full maturity of the vestibular system achieved

A

10-14 years old

46
Q

when does static balance begin

A

9-12 years old

47
Q

when does dynamic balance begin

A

12 years

48
Q

when does the vestibular system begin to decline

A

40s

49
Q

___% reduction in hair cells and ____% reduction in peripheral nerve fibers in adults over 70

A

40%
36%

50
Q

what is the starting position of the functional reach test

A

arm closest to the wall
feet together
keep shoulders square

51
Q

what metacarpal is used to measure during functional reach test

A

third

developmental final (9 decks)

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