Dual mechanism theory

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The Dual Mechanism theory also known as the "words and rules" theory was summarised in Steven Pinker's book of the same name.

It is the theory that regular past tense verbs are generated by rules and the irregular past tense verbs are stored in the lexicon.

In more explicit neurological terms that is that Regulars are generated in the Left interior frontal lobe which supports rules, and irregulars are stored in the Temporal lobe which houses the lexicon.

This theory is backed up by evidence from aphasics with damage in one of the two areas listed above having difficulty with either the regulars or irregulars depending on the area damaged.

Crossmodal priming data (Marslen-Wilson, 1993) also stands up to the dual mechanism theory as facilitation occurs with the regular verbs but not the irregular ones.

Marslen-Wilson & Tyler (1998), however, showed that both regulars and irregulars pattern with repetition priming.

Wug-testing also shows that both regular and irregular past tense forms are productive. (Albright and Hayes, 2003)


References

Albright, A, and Hayes, B P. 2003. Rules vs. analogy in English past tenses: a computational/experimental study. Cognition 90:119-161

Marslen-Wilson, W. D. 1993. Issues of process and representation in lexical access. In G. T. Altmann & R. ShiUcock (Eds.), Cognitive models of speech processing: The second Sperlonga meeting (pp. 187-210). Hillsdale, NJ: Erlbaum.

Marslen-Wilson, W. D., & Tyler, L. K. 1998. Rules, representations, and the English past tense. Trends in Cognitive Sciences, 2(11), 428-435.

Pinker, S. 1999. Words and Rules: The Ingredients of Language. Basic Books