Week Three - Speech Perception & Production Flashcards
What is the segmentation problem?
No clear boundaries between words
How do we solve the segmentation problem?
Possible word constraint: We like to segment speech so that it maps onto whole, possible words
Meaning Constraint: We prefer the mapping to make sense
What is the Invariance problem?
Phonemes are not always pronounced/perceived the same way
In what ways do phonemes vary?
Surrounding sounds
speech sound
speaker accent
speech formality
2 ways invariance problem presents itself?
Assimilation: Sounds take on some of their neighbours properties (song, Tom)
Coarticulation effects: Sounds can be produced more quickly/easily
What are allophones?
Phonemes pronounced slightly differently, but don’t contribute to differences in meaning (Tom, burton)
Voice onset time (VOT)
time between the burst and onset of voice (helps determine diff between eg p and b)
How does context help in identifying sounds/words?
Cause it is influenced by higher-level knowledge of semantics and syntax
When are single words better recognised?
In sentences than alone and against noisy background, and when same words are excised from sentences
Where does phonemic restoration occur?
At the word level
Template Matching Model of SP?
Target words are stored as templates. When we hear a word, it is matched to the stored mental template, recognition occurs.
Analysis by Synthesis Model of SP?
Motor theory: we interpret speech with reference to our own motor speech movements
Strength & weaknesses of ABS Model?
accounts for speaker differences
speech recognition seems driven by data and not hypothesis
Cohort Model of SP?
When we hear speech, we set up a cohort of possible words to decide which we heard. Items eliminated until one is left and this is assumed to be the word heard.
Stages of Cohort Model?
Access stage: representation of word
Selection stage: one item chosen
Integration stage: syntactic and semantic properties are used to integrate into sentence
