N200

• The N200 is a negative peak that in the ERP wave for the target stimulus immediately

precedes the P3b.

• This ERP feature is linked to the cognitive processes of stimulus identification and

distinction, and its peak latency has been shown to correlate with measures of executive

function and attention.

• Published studies have reported delayed latency and smaller amplitude for the N200 in AD

subjects.

• Patients that have suffered a concussion can also show changes in the N200, though that

is not common.