What is Error-related negativity?
The error-related negativity (ERN) is an event-related brain potential that occurs within 50-100 milliseconds of making an error. Generated by the anterior cingulate cortex, it reflects automatic error detection that precedes conscious awareness.
How it works
The ERN is observed in EEG recordings as a negative voltage deflection at frontocentral electrode sites immediately following an incorrect response. It occurs even when the person is unaware they made an error, indicating automatic monitoring. Larger ERNs are associated with greater error significance, anxiety, perfectionism, and conditions like OCD. The signal is thought to reflect a prediction error: the mismatch between the intended and actual action.
Applied example
In a rapid response task where participants occasionally press the wrong button, the ERN appears 50-80 milliseconds after the incorrect press, while conscious awareness of the error takes 200+ milliseconds. The brain detects the error nearly three times faster than the person becomes aware of it.
Why it matters
The ERN demonstrates that the brain has an automatic error-monitoring system that operates independently of consciousness, providing the neural basis for the feeling that ‘something is wrong.’
