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Past Tense (Single route model (Marsen Wilson & Tyler (1998) (Semantic…
Past Tense
Single route model
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Training
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Initially trained on 10 mostly irregular, then expanded to 420 regular words
Showed vocabulary explosion drove the model to give more weight to irregulars, resulting in interference and over regularisations
Overregularisations due to the fact that single set of connections is used to represent relations of many verbs
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Dual stage models
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Ulman (1977)
AD patients show more difficulty inflecting irregular than regular words, consistent with the fact that they have declarative memory damage (so no access to lexicon)
PD showed more difficulty inflecting regular, consistent with damage to frontal lobe and basal ganglia (so can't inflect)
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