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Modelling the perceptual development of phonological contrasts with OT and Gradual Learning Algorithm Paola Escudero, University of Reading p.r.escudero@reading.ac.uk Paul Boersma, University of Amsterdam paul.boersma@hum.uva.nl 25 th Penn Linguistics Colloquium March 3, 2001

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Modelling the perceptual developmentof phonological contrasts with OT and Gradual Learning Algorithm

Paola Escudero, University of Reading

p.r.escudero@reading.ac.uk

Paul Boersma, University of Amsterdam

paul.boersma@hum.uva.nl

25th Penn Linguistics Colloquium

March 3, 2001

sound contrasts
Sound contrasts
  • Sound contrasts and acoustic information
  • An example of a sound contrast
  • What are the acoustic differences between the two?
why using the nearest production prototype in perception
Why using the nearest production prototype in perception?
  • Answer: “likelihood maximisation”:choose the most likely produced category,given a certain F1 & duration
  • Functional principle: “minimise the probability of perceptual confusion”
how baby elspeth learns
How baby Elspeth learns
  • Little Elspeth makes a mistake when categorising [350 Hz, 80 ms]
three types of real l2 categorisation
Three types of real L2 categorisation

Spectral reliance only

Cue integration

Duration reliance only

summary
Summary
  • For our perception model, we assumed:
  • Perception is handled by an OT grammar
  • Its acquisition is handled by the GLA
  • L2 learners start by copying their L1 grammar
  • With these assumptions, we can model:
  • L1 Scottish and Southern English
  • L2 Scottish and Southern English, partially
conclusion
Conclusion
  • Cue reliance depends on cue reliability, or

a) Differences in the production environment account for differences in perception.

b) Changes in the production environment lead to changes in perception.

  • The functional principle underlying this production-perception dependence is “minimisation of perceptual confusion”.
  • This functional principle follows from our formal modelling of the perception grammar.