Aphasia is not a single condition. The label describes a family of language disorders, each with a different profile of strengths and difficulties. The specific type depends on which part of the brain's left-hemisphere language network was damaged — not on how severe the stroke was overall.
Key Takeaways
- ✓The type of aphasia determines what is most difficult: speaking, understanding, reading, writing, or all of these.
- ✓Aphasia type often changes as recovery progresses — moving from more severe to milder forms.
- ✓Knowing the type helps clinicians select the right therapy approach from the start.
- ✓Intelligence and memory are not affected by aphasia, regardless of type.
Broca's Aphasia (Non-Fluent / Expressive)
Broca's aphasia follows damage to Broca's area in the frontal lobe of the left hemisphere. The person understands the majority of what is said to them but speaks slowly, with significant effort, in short phrases or single words. Grammatical function words ("the," "is," "and") are often omitted, producing telegraphic speech.
A person with Broca's aphasia knows what they want to say but cannot get it out fluently. This is often acutely frustrating and can be associated with higher rates of depression and emotional distress.
Therapy targets expressive output: word retrieval, sentence formulation, and structured repetition exercises. High-intensity practice is particularly important in this type because expressive gains are driven by learning, not spontaneous recovery.
Wernicke's Aphasia (Fluent / Receptive)
Wernicke's aphasia follows damage to Wernicke's area in the posterior temporal lobe. The person speaks fluently and at a normal rate — sentences have normal prosody and grammatical structure — but the content is often meaningless. Made-up words (neologisms) and real words used in wrong contexts are common.
Critically, comprehension is severely impaired. The person may not understand what is said to them and may be unaware that their own speech is not making sense. This lack of awareness (anosognosia) is a feature of the disorder, not a psychological defence.
Therapy focuses heavily on comprehension training and auditory processing before targeting expressive accuracy.
Global Aphasia
Global aphasia results from large left hemisphere strokes damaging both the frontal and temporal language regions. It is the most severe form. Both expressive language and comprehension are profoundly impaired. The person may be limited to a few words, sounds, or automatic phrases such as "yes," "no," or a frequently repeated syllable.
Despite severe language impairment, non-verbal communication — gesture, facial expression, drawing — is often relatively preserved and becomes a critical target for therapy. Functional communication goals are prioritised.
Global aphasia can shift toward Broca's aphasia as the temporal lobe recovers, which is why early therapy matters even when prognosis appears poor.
Anomic Aphasia
Anomic aphasia is characterised by difficulty finding specific words, particularly nouns and verbs, while comprehension and fluency are relatively preserved. It is the mildest form and often the final stage of recovery from other aphasia types.
Word-finding difficulties — pausing, circumlocuting ("the thing you use to..."), or substituting a related word — are the primary symptom. The person can usually read and write reasonably well and communicates effectively in conversation, though with frequent frustrating tip-of-the-tongue moments.
Anomia responds well to structured word-retrieval therapy and cued naming practice.
Conduction Aphasia
Conduction aphasia involves damage to the arcuate fasciculus, the white-matter pathway connecting Broca's and Wernicke's areas. Comprehension is relatively good and spontaneous speech is fluent, but repetition is disproportionately impaired. The person struggles to repeat words or phrases back accurately, often producing phonemic paraphasias (substituting sounds within a word).
Primary Progressive Aphasia (PPA)
Unlike stroke-related aphasia, primary progressive aphasia (PPA) is a neurodegenerative condition that develops gradually over months and years. Language abilities decline progressively while other cognitive functions are initially preserved. There are three variants:
- •Nonfluent/Agrammatic PPA: effortful, telegraphic speech with good comprehension; associated with frontotemporal dementia pathology.
- •Semantic variant PPA: fluent speech but severe word comprehension deficits; single-word meaning is lost.
- •Logopenic variant PPA: difficulty retrieving words and repeating sentences; often associated with Alzheimer's pathology.
Speech therapy for PPA focuses on maximising functional communication and building compensatory strategies before language deteriorates further.
How aphasia type changes over time
Aphasia type is not fixed. The most common trajectory is from more severe to less severe: global aphasia may evolve to Broca's aphasia; Broca's aphasia may evolve to anomic aphasia. This shift reflects both spontaneous neurological recovery and the accumulation of therapy-driven gains.
Regression to a more severe type is rare and usually indicates a secondary neurological event rather than a failure of therapy.
Starting therapy
Understanding your aphasia type is the first step. The next is ensuring the therapy plan targets the right skills at sufficient intensity. Our guide to therapy intensity explains why dosage matters as much as technique — and how structured home practice between sessions closes the gap.
If you are a clinician looking for condition-specific exercise modules, ReSpeak's exercise library is organised by aphasia type and communication target.
