A weekly presentation was given by Dr. Basima Othman at English Department on Monday November 11th . Here is a summary of the presentation. The bidirectional prediction of verbal changes by approaches of rules and storage is in conflict with the prediction by the dual mechanism approach that defends the necessity of two separate mechanisms for language processing: storage and for irregular processing and rules for regular processing. Irregular verbs can be produced correctly if they are memorized and retrieved successfully before the rule-governed route creates forms of regularization.
Nevertheless, the irregularization rate is predicted to be rare compared to the regularization rate. Hence, from the dual mechanism perspective, verbal changes mostly occur unidirectionally, towards regularization only.
To date, many studies of language processing cannot offer fully results that undoubtedly approve the predictions of either approach.