Brain's language network is more extensive than previously thought
MIT researchers have discovered that the brain's language network extends beyond classical language areas into regions previously associated with higher cognition, such as the prefrontal cortex and default mode network. The findings suggest language processing involves a broader neural system than traditionally assumed.
Background
- Researchers at MIT and elsewhere have long mapped language processing to a specific set of brain regions, mostly in the left hemisphere (e.g., Broca's area). This new study used high-resolution fMRI to show that the network responsible for understanding and producing language is significantly larger, involving areas previously linked to other cognitive functions like memory and social cognition.
- The finding challenges the classical "modular" view of the brain, where language is handled by a small, dedicated set of regions. It suggests language relies on a much broader, more distributed system that overlaps with other high-level thought processes.
- This matters because it could reshape how we understand language disorders (e.g., aphasia after stroke), how brain stimulation or surgery is planned, and how AI models of language are compared to human brain activity. It also raises philosophical questions about how language relates to other forms of thinking.