Lecture 1 Flashcards
Define articulation
How speech sounds are made : Airstream is modified by active and passive articulators.
> Motor processes involved in the movements of articulators (lips, tongue etc)
> Is a special form of motor learning.
> Described in terms of sounds /phones /phonetics .
Define phonetics
the study/measurement of speech sounds (physical production, acoustic transmission and perception of the sounds of speech)
> Speech sound = basic unit of phonetics
> Focus is on form/structure not meaning
Define phonology
the description of the systems and patterns of phonemes that occur in a language
Define Phonotactics
Phonological constraints on what sounds can appear in what positions in a given language
What is speech sound development?
Gradual articulatory mastery of speech sounds
What is Phonological development
implies acquisition of a functional sound system. It is NOT simply learning to produce different sounds. Its learning the contrasts between sounds that covey meaning.
What are Bieile’s 4 stages of linguistic development?
- Pre-linguistic stage (Reflexive, cooing, vocal play, babbling and jargon)
- Linguistic stage (First fifty-word stage 12-24 months)
- Pre-School age (2 years to 5 years)
- School age (5 yrs +)
What is the fetal auditory experience?
The auditory system becomes functional at ~25 weeks of gestation. The last 10-12 weeks of fetal life (>28 weeks i.e. 3rd trimester) -meaningful outside auditory experience
> Critical window for auditory neurosensory development : 25 weeks of gestation and up.
Define categorical perception
sounds varied on a continuum are perceived according to phonemic categories in native language. Demonstrated in 1 month infants for/ba/-/pa/ continuum (inferred from changes in sucking rates).
At what age do infants lose the ability to discriminate between non-native sounds
ability is lost by 1yr
How much of a language delay did fetuses present with at birth when language exposure in utero was absent?
2 month delay
What are the 5 sub stages of the prelinguistic phase (From 0-12 months)
> Reflexive (0-2) > Cooing (2-4) > Vocal play (4-6) > Cannonical Babbling (6-10) > Jargon (10+)
Within the cooing stage what is Quasi-resonant nuclei (QRN)
Non-crying vowel-like (vocoids) sounds with brief consonantal elements (contoids- consonant-like).
During cooing where are most sounds produced?
In the back of throat (Velars, glottals and nasals) and sounds are somewhat nasalized due to proximity of larynx and vocal tract
What occurs during the vocal play stage?
Production of prolonged vowel/consonant-like steady stages.
> Nasals, liquid, bilabial trills.
> Increase in tongue control (protrusion/retraction/height)
> Increase in control of lip constriction
> Variations in loudness & pitch.
List and define the two types of cannonical babbling that occur during the babbling stage.
(1) Reduplicated: Strings of CV/VC, vowel quality may vary; consonants stay the same from syllable to syllable [e.g. baba].
2) Nonreduplicated (varigated): Variations in both C and V from syllable to syllable (e.g.[batƏ]). 1 &2 stages are not sequential. Although, self-stimulatory in nature by end of this stage babbling may be used in imitation games.
During the babbling stage children achieve fully resonant Nuclei (FRN) - what does this mean?
adult like (front and central)vowels+ Consonants: stops (p,b,t,d,g,k), nasals + glides (j). Primarily: labial and alveolar. Overlaps with 1st words.
What occurs during the jargon phase
Strings of babbled utterances modulated by intonation, rhythm and pausing.Language specific.Delivered with eye-contact and gesturesIntentional & sounds like child is attempting real sentences.
What types of sounds are common during the babbling stage?
adult like (front and central) vowels + Consonants: stops (p,b,t,d,g,k), nasals + glides (j). Sounds mostly labial and alveolar
What is the continuity hypothesis?
Current thinking. Babbling varies depending on the linguistic environment in which a baby is raised and provides sensory-motor practice for later speech-language development.
What does the Ratio of babbling tell us?
If Vocoids > contoids = Less language growth
What does the complexity of babbling tell us?
Greater babble complexity = Greater language growthGreater variety of contoid production = Greater language growth
What should we look for in infant babbling?
> Range and diversity of vocoids/contoids
Syllable shapes
Vocalization length and complexity
(e.g. encourage parents to look for non-reduplicated babble)
Intonation/prosodic features
Intentional communication (eye contact/gestures).
What are the 5 steps in the development of speech motor control for infants?
Sequence:
1. Jaw control comes first. Early phonemes are driven by the jaw (vowels), as they have limited control over the lips and tongue for producing other consonantal sounds.
- Ballistic jaw movements = stops come early; graded force control required for fricatives/affricates etc come later.
- Jaw movements similar to adults at 12 months; lips between 2-6 years.
- Independence of lower lip/tongue from jaw and ability to coordinate them allows expansion of phonetic inventories. (reason why labio-dental fricatives [f,v] appear >2yrs).
- Speech motor control refinements continue even after 6 years of age.
Most vowels and diphthongs with the exception of rhotics (e.g., /ɚ/ and /ɝ/) are produced with ___ accuracy from age ____ onwards.
85%, age 2
What do vowel errors indicate?
Vowel errors may be phonological or indicate serious motor control issues in jaw/lip/tongue.
Vowels (a,i,e,o,u etc)and Nasals (m,n/except ŋ) are the _____ to develop during the _____ phase of prelinguistic development
First, Cooing
After vowels and nasals what sounds are acquired next and in which stage?
Stops emerge during babbling
- Lip control (p/b)
- Tongue control (k/g/t/d)
What sounds begin to emerge after stops? What allows these sounds to develop?
- Glides (/w/ earlier than/ j/)
- Fricatives (s,z,∫; exception is /f/ mastered early @ 3yrs)
- Liquids (l/r)
- Affricates
Develop alongside
> finer airflow/timing control
> Coarticulation with prosody (in jargon)
Under all categories sounds made with ____ are mastered first, then tongue
lips
What are the early eight sounds and at what age?
Early eight [<3;0]
/h/, /p/,/b/,/m/ /d/,/n/, /w/,/j/*