Aphasia

Aphasia consists of a breakdown
in the two-way translation process that establishes a correspondence between
thoughts and language.

Patients with aphasia are not able to translate, with reasonable
fidelity, the nonverbal images which constitute thought into the symbols
and grammatical relationships which constitute language. In most instances of
aphasia, the inverse process is also defective, so once a word or sentence is heard
the patient cannot construct the nonverbal images which correspond to the meaning
behind the language.

Aphasia not only disrupts communication but anyability whose final performance depends on the use of internal speech.

Decisionmaking,
creativity, and the ability to perform calculations are often compromised
because of a primary language defect, although, in and of themselves, these abilities
are in good part independent of language.

Broca's Area... We have suggested that this system is concerned with the relational
aspects of language, which include the grammatical structure of sentences
and the proper use of grammatical morphemes and verbs.

ANTONIO R. DAMASIO AND HANNA DAMASIO