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Pinker addresses neuropsychological dissociations that arise in two types of aphasia: anomia and agrammatism. Anomic patients often produce fluent and generally grammatical speech despite having difficulty retrieving and recognizing words, which implies the lexicon is "more impaired than grammatical combination" (cite essay). Some patients also have jargon aphasia in which they speak their own neologisms (e.g. "nose cone" for "phone call") and often add regular suffixes onto their jargon, which suggests the area of the brain that computes regular inflection is distinct from the area in which words are processed (cite book). In contrast, agrammatic patients have difficulty assembling words into phrases and sentences and applying correct grammatical suffixes (either omitting them altogether or using the wrong one) and are therefore unable to produce fluent grammatical sequences (cite book). For example, when reading a list of words patients might read smiled as "smile" and wanted as "wanting")(cite book). The reason for this is that regularly inflected words are computed by rules as they are read, and that agrammatic patients have damage to the machinery that does the computing. However, when reading irregular past-tense forms and plurals, patients with impaired grammatical processing make fewer errors as they are still able to match irregular verbs against memory as wholes (cite book).