6 lecture_nov16_PastTense

6 lecture_nov16_PastTense - Why the past tense Past tense...

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Copyright Thomas R. Shultz 1 past tense 1 Past tense In English & the German plural past tense 2 Why the past tense? Integrates ideas from Language Language acquisition Cognitive development Rules Vs. connections past tense 3 Past-tense morphology Regular past add suffix -ed to stem walk/walked About 180 irregular verbs Identity: hit/hit Vowel changes: come/came Arbitrary: go/went past tense 4 What is U-shaped development on the past tense? past tense 6 Theories Classical rule-rote theory Connectionist network models Neo-classical rule- association hybrid past tense 7 What is the classical rule- rote theory?
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Copyright Thomas R. Shultz 2 past tense 9 Connectionist network models Rules & exceptions can be produced in homogeneous system Rule is a high level description of what is going on in network past tense 10 2-layer perceptron with delta rule Present stem as input Past tense as output Heavily criticized by psycholinguists Not psychologically realistic past tense 11 Plunkett and Marchman Inverted U effect by manipulating type & token frequencies of regular and irregular forms Type: class (each verb) Token: instance of class (instance of a verb) past tense 12 Conform to biases of spoken English Regular verb forms had to be High in type frequency Low in token frequency Irregular verb forms had to be Low in type frequency (180) High in token frequency Gradual expansion of vocabulary
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This note was uploaded on 02/14/2011 for the course PSYC 532 taught by Professor Shultz during the Fall '10 term at McGill.

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6 lecture_nov16_PastTense - Why the past tense Past tense...

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