What is Salience network?
The salience network is a large-scale brain network centered on the anterior insula and anterior cingulate cortex that detects personally relevant stimuli and orchestrates appropriate behavioral responses by switching between other brain networks.
How it works
Menon’s (2011) triple network model proposes that the salience network acts as a switch between the default mode network (internal focus) and the executive control network (external focus). When the salience network detects a personally relevant stimulus (a threatening sound, a social signal, an unexpected reward), it suppresses the currently active network and activates the appropriate one. Dysfunction of the salience network is implicated in conditions where the brain fails to appropriately detect salience (depression, autism) or overdetects it (anxiety, psychosis).
Applied example
A person daydreaming during a meeting (DMN active) suddenly hears their name called (salience network detects relevance) and immediately shifts to focused attention on the speaker (ECN activated). This rapid network switch, orchestrated by the salience network, happens within hundreds of milliseconds.
Why it matters
The salience network is the brain’s relevance detector and network switcher, determining what gets attention and ensuring that the brain’s limited resources are directed toward what matters most in the current moment.
