Big thing Flashcards
(141 cards)
How is visual acuity assessed in infants
Assessed by using preferential-looking paradigm.
Infants presented with a succession of paddles with increasingly narrower stripes and narrower gaps between them until infant can no longer distinguish between stripped paddle and plain gray one.
At what distance can a baby at birth see?
Can see 8-10cm from face: distance between baby & mom’s face.
Does synaptic pruning differs across domains?
Yes. Synaptic pruning happens earlier in some functions than others. E.g. earlier in sensory pathways than language (and earlier in language than higher cognitive functions).
What’s an evidence of perceptual narrowing in face perception
Infants becoming face specialists. They demonstrate the other-race-effect
Is object segregation present from birth? Explain with an experiment. Give the ages.
No, learned by experience. Experiment with the cube with the whole rod vs broken rod.
4 month olds: Preferred to look at the broken rod.
Newborns: Looked the same amount of time at broken rod and single rod.
How is the monocular depth perception assessed?
Visual Cliff experiment. 6 months olds will not crawl over visual cliff but younger children will.
How can we use music to study auditory development? (2)
(1) Similarity to language
(2) Evolution
How is music similar to language? (3)
(1) Both require to apply a set of rules/principles to organize/make sense of the auditory world.
(2) Both engage multiple regions/processes in brain
(3) Correlated: we can learn about one by studying the other
How is music useful to the study of evolution? (3)
(1) Music is innate: responses to music are present in utero.
(2) Music is universal: music production exists in every society studied to date.
(3) Music is adaptive: it fulfills multiple functions in human society.
Anatomy: Outer and middle ear
When something in the world moves or vibrates, it creates a wave that travels into the auditory canal. Sound waves cause the eardrum to vibrate, triggering vibrations in three small bones (malleus, incus, stapes).
Anatomy: Central nervous system
Electrical signals travel along the auditory nerve, through the brainstem and into primary auditory cortex in the right and left temporal lobes.
Melody (3 characteristics)
(1) A sequence of pitches that has some logical sense.
(2) Made up of intervals; thus, at least 2 pitches are required.
(3) Has a contour (a pattern of intervals going up and down).
Why are pitch, melody, beat, rhythm and timbre important in auditory development?
Help infants learn how the sounds of their native language map onto meaning.
Why does the fetus only hear low-frequency sounds?
The earliest cells to develop are responsive to low frequencies, and the latest cells to develop respond preferentially to high frequencies. -> cells in cochlea develop in a TONOTOPIC fashion
What’s identification in music and why is it important?
Ability to perceive discrete speech sounds (phonemes). Important for the development of language.
Basic auditory abilities (3) (Already developed at birth)
Localization, Identification, Discrimination
Why does the process of perceptual narrowing of pitch occur? (2) i.e. the fact that the ranges of pitches infants can discriminate gets more narrow.
(1) Attachment. Being able to bond with caregivers is more likely to ensure survival; thus, the auditory system needs to be optimally sensitive to pitches emitted by caregivers.
(2) Language. Infants need to be able to adopt their native language(s); thus, a wider range of sensitivity ensures optimal language acquisition.
=> Parents also use pitch to draw attachment (IDS)
When the mother is silent, the most prominent sounds that can be heard are: (3)
(1) Bowel sounds (irregular, ‘popping’)
(2) Maternal heartbeat (regular, slow)
(3) Fetal heartbeat (regular, fast)
How does motor development evolve? (from … to … in the body)
from head to feet and from the midline of the body out.
movement from the head/trunk -> clapping -> marching
Overall, children’s rhythmic abilities develop more slowly and are more variable than adults. Why is that?
Rhythmic abilities = Multimodal. And some of these brain regions don’t mature fully until late adolescence. (!!!Cultural familiarity also plays a role)
We make a distinction between perceived & felt emotions. What is the difference?
Perceived emotion is inferred.
-> Linked to features of the musical stimulus (pitch, tempo…)
Felt emotion is evoked.
-> Linked to activation of the nervous system.
Characteristics of motor milestone (2)
(1) Happen in orderly sequence, rarely out of order.
(2) Huge individual variation in the ages these milestones are achieved.
Why do some babies skip crawling? (4)
(1) Upper body or core weakness
(2) Hypersensitive to the texture of the floor
(3) Tonic neck reflex still present
(4) Insufficient opportunity: baby not enough on the floor
Explain the role of encouragement in motor skills by citing 2 examples.
1) In some countries, some infants are actively discouraged from crawling because of safety or hygiene concerns so crawl later or never crawl. (e.g., urban China)
2) Motor exercises in sub-Saharan Africa. Infants are more advanced in motor skill development than kids in North America. Common practices to do motor exercises with the kid, lead to earlier achievement of milestones.