Which type of aphasia is characterized by smooth speech flow but grammatical errors and poor comprehension?

Wernicke's aphasia is characterized by fluent speech that maintains a natural flow but is often filled with grammatical errors and lacks meaningful content. Individuals with this type of aphasia can produce long strings of sentences that may include nonsensical words or phrases, making their speech sound smooth and effortless. However, they struggle significantly with comprehension, which means they may not understand what others are saying or the context of their own speech.

This severe deficit in understanding language is a hallmark of Wernicke's aphasia, distinguishing it from other forms of aphasia such as Broca’s aphasia, where speech is typically non-fluent and comprehension is relatively preserved. In summary, the key features of fluent but nonsensical speech coupled with poor comprehension make Wernicke's aphasia the correct choice for this question.