“…This yields the ''partial'' activation of base forms when the irregular past tense form is accessed. These findings, together with the linguistically motivated distinction between a universal default and a lexical storage system (Chomsky & Halle, 1968) lay the cornerstone for the so-called ''dual mechanism'' account for inflectional systems (e.g., Clahsen, 1999;Clahsen, Eisenbeiss, Hadler, & Sonnenstuhl, 2001;Clahsen, Eisenbeiss, & Sonnenstuhl-Henning, 1997;Pinker, 1998Pinker, , 1999Pinker & Ullman, 2002;Prasada & Pinker, 1993;Ullman, 2001). The model assumes two innate but completely separate systems: a parsing system that applies default rules to base forms, and a lexical storage system that stores all exceptions to these default rules as whole words.…”