1.3. Interaction between core and non-core lexicon
Regardless of the distinction that we have made in the previous section, the core and the non-core lexicon do not constitute independent systems. On the contrary, the two systems appear side by side in any fragment of signed discourse and contribute to meaning. LSC may alternate between both types simultaneously or sequentially [LEXICON 1.2.1].
However, depending on the register and style used one type may be more frequent than the other (formal register may use more core lexicon whereas poetic registers tend to use more the non-core lexicon, which offers more expressive options). Moreover, the boundary between each type is not always clear because of the two-way interaction between them: i) the non-core lexicon can undergo a process of lexicalization and become part of the core lexicon, and ii) elements from the core lexicon can be modified and show behavior typically found in the non-core lexicon.