Which type of aphasia is associated with posterior lesions?

Fluent aphasia is indeed associated with posterior lesions in the brain, particularly within regions that affect language comprehension and production. This type of aphasia arises from damage to areas such as Wernicke's area, which is located in the dominant hemisphere's superior temporal gyrus. Individuals with fluent aphasia often exhibit relatively preserved speech production in terms of rhythm and rate, but their speech may lack meaningful content or exhibit neologisms (made-up words) and paraphasias (errors in word choice).

In contrast, other types of aphasia, such as Broca's aphasia and non-fluent aphasia, involve frontal lobe lesions, which impact the ability to produce grammatically correct speech. Mixed transcortical motor aphasia is characterized by non-fluent speech due to a disconnect between the areas responsible for comprehension and those for speech production, but it does not primarily manifest from posterior lesions. Consequently, the association of fluent aphasia with posterior lesions highlights the significance of those brain regions in facilitating fluent and coherent language output.