Summary
Broca's area drives speech production and Wernicke's area supports comprehension, in a distributed network.
In depth
Broca's area (left inferior frontal gyrus) damage causes non-fluent aphasia; Wernicke's area (posterior temporal) damage causes fluent but meaningless speech. The arcuate fasciculus connects them. Modern views see a wider network and dual streams.
Language involves a distributed network including the arcuate fasciculus. Aphasia types depend on lesion site. Bilingual brains show adaptation.
Key idea: language is not confined to two areas.
Broca's area in the left inferior frontal gyrus was described by Paul Broca in 1861 from patient Tan, who could say only that syllable, while understanding well. Wernicke's area in the posterior superior temporal gyrus, from Carl Wernicke (1874), when damaged gives fluent but meaningless speech with poor comprehension. The arcuate fasciculus connects them, and damage causes conduction aphasia (poor repetition). Modern models (Hickok and Poeppel's dual stream) describe a ventral stream for meaning and dorsal for sound-to-articulation mapping, and language engages widespread networks including the angular gyrus, insula and basal ganglia.
About 95 percent of right-handers and 70 percent of left-handers have left-hemisphere dominance. Children with early left hemisphere damage often develop language in the right. Sign language uses the same left-hemisphere regions as speech. Language genes such as FOXP2 are linked to speech disorders. Aphasia therapy can improve recovery after stroke.
Example: patients with Broca aphasia understand 'the boy is hit by the girl' less easily than simple sentences, showing a role for syntax.
Frequently asked questions
What is Language Areas of the Brain?
Broca's area drives speech production and Wernicke's area supports comprehension, in a distributed network.
Which area of biology covers Language Areas of the Brain, and how advanced is it?
Language Areas of the Brain is one of the 54 topics in Neuroscience. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include Brain Regions, Neurodevelopmental Disorders, Visual Cortex Processing.
Can you give an example of Language Areas of the Brain?
Most right-handers have left-hemisphere language dominance.
What should I learn before Language Areas of the Brain?
Work through the Beginner topics in Neuroscience first, such as Nervous System, Neuron, Central and Peripheral Nervous Systems, then return to Language Areas of the Brain. Advanced topics assume the Intermediate vocabulary.
What topics are related to Language Areas of the Brain?
The closest topics to Language Areas of the Brain are Brain Regions, Neurodevelopmental Disorders, Visual Cortex Processing, Optogenetics. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Language Areas of the Brain?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Language Areas of the Brain. To practise the whole of Neuroscience, use the Neuroscience quiz.
How is Language Areas of the Brain different from Brain Regions?
Language Areas of the Brain: Broca's area drives speech production and Wernicke's area supports comprehension, in a distributed network. Brain Regions: The cerebrum, cerebellum and brainstem control thought, coordination and vital functions. Read both side by side and note what each one explains.
How should I study Language Areas of the Brain step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Brain Regions and explain the difference aloud. Finally, take the Neuroscience quiz and come back to this page for any question you miss.