These areas would ordinarily assign words and meanings, string words together, and complete other word-based tasks. The exact symptoms vary from individual to individual. For example, some aphasic persons do not understand speech at all, while others recognize familiar personal names and are able to follow whole-body commands. While no aspect of language is functional, certain aspects may be more impaired than others. Yes, particularly if the brain injuries extend beyond Wernicke's and Broca's areas.
Depression is another condition that is associated with global aphasia.
Aphasias are diagnosed and evaluated through testing, which may involve asking the person to name objects, answer questions, and follow commands. Often, the first test is administered by a physician who suspects aphasia. Bungalow Software has a series of programs for Aphasia. It has free-trial versions of over 50 programs. Quick and easy to use.