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Lecture 13

Lecture 13..docx

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Western University
Psychology 2115A/B

Speech Perception Cont‟d 11/14/2012 12:33:00 PM  Phoneme basic unit of speech  All the theory‟s discussed are based on how do we perceive individual phonemes  Vowels: have nice pattern; predictable 1:1 nature  Consonants: no pattern to them not a 1:1 ratio o Violate principal of linearity: for every speech sound there is a pert of a speech signal (if isolate the consonant, and play back, will not sound the same) o No violations when you are reading these, only in speech and souynd  We can use categorical perception assume that is similar in there sound they are the same thing (differentiation of a phoneme is still the same phoneme Motor theory‟s (Stevens and Halle 1964) analysis by synthesis  Speech is not perceived just as a auditory phenomenon, but also a motor phenomenon  You perceive speech, not by taking in frequency, but by asking yourself how would I have made those sounds  Filtering the sounds through your articular apparatus  So not just the sound, the motor movements to make this sound  When you produce a “d” sound, you produce it the same way each time (d sound in duh, dad etc.)  The articulatory nature of the sound does not change, no matter what is put behind the consonant  Is there evidence? o This launched people in to different experiments Experiments  1. Lehiste and Peterson (1959) o Beet and Boat  contrast the words, think about the vowels o There is a difference in physical intensity one of them sounds louder: Beet is louder (the „ee‟ sound) o Could tell this by running a spectrogram o Created an experiment where they artificially equated the intensity of the two vowels made the vowel intensity the same o Asked people which one was louder? o If the theory is right: you would hear beet and boat. You would have to ramp up the intensity of boat to match the intensity of beet because they have been equated  People reported hearing the „oa‟ sound louder (due to them making that sound louder in there head after listening to it) o If the theory is not right: you would here the sounds as being equivalent  2. Dorman, Raphael and Liberian (1979) o if you say the phrase “please say shop” o then you record it o the person who records it, splits the tape just before you say the word and inserts a 50ms of blank space o this changes what people perceive, now they hear please say „chop‟  there is a lag in the word Chop, but not in shop o putting the pause in there (regarding it didn‟t change the physical stimulus) but they integrate
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