Eclipse Additional Information Page 81
3.21 MMN (if included in your license)
Mismatch Negativity Test (MMN) is designed to retrieve the MMN response phenomenon, which is present
approximately 250ms after stimulus onset. The MMN is present on a calculated differential curve found by
subtracting two waveforms where one is recorded with a frequently appearing sound stimulus and another
recorded with a rare appearing different sound stimulus. Unlike the P300 patient does NOT need to pay at-
tention to the stimuli.
3.21.1 Protocol settings for MMN
The MMN Frequent rate is typically set to 80% frequent and 20% rare. The protocol for MMN differs slightly
from the P300 protocol with the time window being the main difference. The test setup must specify both the
frequent stimulus and the rare stimulus, which can be adjusted from the Protocol Setup in the field high-
lighted above.
For information about the test procedure please refer to the relevant quick guide.
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