On the other hand are errors for which it is difficult to identify a source within the utterance. These are the "noncontextual errors", a category that includes noncontextual substitutions, blends, additions, and deletions.
- Dell (2004), a pag.126

Within the context of the theory one can expect errors of two distinct types occurring at each level of representation - misordering or contextual errors, in which intruding item or items come from the intended utterance, and noncontextual errors, in which the interference comes from outside of the utterance. [...] The second broad class of errors, noncontextual errors, is characterized by interference from the outside the intended utterance. The processes of spreading activation activate nodes that are not part of the intended utterance.
- Dell (2004), a pag.141-142