Speech perception
Download
1 / 43

Speech Perception: - PowerPoint PPT Presentation


  • 291 Views
  • Updated On :

Speech Perception:. Theoretical approaches. Scope of the problem. Speech perception involves the mapping of speech acoustic signals onto linguistic messages (e.g., phonemes, distinctive features, syllables, words, phrases…). Why is the problem theoretically hard to solve?.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Speech Perception:' - MikeCarlo


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Speech perception l.jpg

Speech Perception:

Theoretical approaches


Scope of the problem l.jpg
Scope of the problem

  • Speech perception involves the mapping of speech acoustic signals onto linguistic messages (e.g., phonemes, distinctive features, syllables, words, phrases…)


Why is the problem theoretically hard to solve l.jpg
Why is the problem theoretically hard to solve?

  • Acoustic variability due to context, talker, dialect, rate, prosodic, and other differences.

  • Segmentation problems


Three theoretical approaches l.jpg
Three theoretical approaches:

  • Motor theory

  • Direct realism

  • General approach


Motor theory of speech perception liberman mattingly 1985 l.jpg
Motor theory of speech perception(Liberman & Mattingly, 1985)

  • Listeners perceive gestures (more specifically, intended gestures, or neuromotor commands).

  • Speech is perceived in humans by means of a specialized speech module.


How the speech module works l.jpg
How the speech module works:

…“the candidate signal descriptions are computed by an analogue of the production process—an internal, innately specified vocal-tract synthesizer…—that incorporates complete information about the anatomical and physiological characteristics of the vocal tract and also about the articulatory and acoustic consequences of linguistically significant gestures” (Liberman & Mattingly, 1985, p. 26).



Direct realist theory of speech perception c fowler l.jpg
Direct realist theory of speech perception (C. Fowler)

  • Derived from James J. Gibson’s perceptual theory.

  • Objects of speech perception are actual gestures.

  • No special mechanisms are required.


How direct realism works l.jpg
How direct realism works:

  • “Perceptual systems have a universal function. They constitute the sole means by which animals can know their niches. Moreover, they appear to serve this function in one way: They use structure in the media that has been lawfully caused by events in the environment as information for the events. Even though it is the structure in media (light for vision, skin for touch, air for hearing) that sense organs transduce, it is not the structure in those media that animals perceive. Rather, essentially for their survival, they perceive the components of their niche that caused the structure.” (Fowler, 1996, p. 1732)


General approach to speech perception diehl lotto holt 2004 l.jpg
General approach to speech perception (Diehl, Lotto, & Holt, 2004)

  • Objects of speech perception are (primarily) acoustic/auditory events.

  • Speech perception relies on general mechanisms of audition and perceptual learning.





English identification functions for vot stimuli superimposed on vot frequency histograms l.jpg
English identification functions for VOT stimuli superimposed on VOT frequency histograms


English discrimination functions for vot stimuli l.jpg
English discrimination functions for VOT stimuli superimposed on VOT frequency histograms



Thai discrimination functions for vot stimuli l.jpg
Thai discrimination functions for VOT stimuli on Thai VOT frequency histograms


Tone onset time tot a nonspeech analog of voice onset time vot pisoni 1977 holt lotto diehl 2004 l.jpg

- on Thai VOT frequency histograms50 TOT

+50 TOT

0TOT

Frequency (Hz)

Time (ms)

50 ms

50 ms

Tone onset time (TOT): a nonspeech analog of Voice onset time (VOT) (Pisoni, 1977; Holt, Lotto, & Diehl, 2004)



Vot identification by chinchillas kuhl miller 1981 l.jpg
VOT “identification” by chinchillas Diehl, 2004)(Kuhl & Miller, 1981)


Ga ka identification by typically developing children and dyslexic children with and without adhd l.jpg
/ga/-/ka/ identification by typically developing children and dyslexic children (with and without ADHD)


Back to the three approaches to speech perception l.jpg
Back to the three approaches to speech perception and dyslexic children (with and without ADHD)

  • Motor theory

  • Direct realism

  • General approach


ad