Interacoustics Eclipse Additional Information page 34

Eclipse Additional Information
The residual noise bar will be grey until the residual noise criterion is reached (e.g. 40nV). If enabled the bar
will turn green with a checkmark when the criterion is reached. Show response confidence & residual
noise bars are enabled/disabled in the General Setup.
Fmp & Response Confidence
Fmp is the statistical F-value calculation for multiple points. Fmp works on the principle of comparing re-
sponse amplitude to residual noise to provide the confidence level or detection rate. The underlying analysis
considers the ABR recording in a 10 ms
the residual noise. In a response situation, lower noise or larger response amplitude will drive the Fmp up
(indicated by the red line above). In a no-response situation the response amplitude will not rise above the
residual noise and Fmp will remain low.
The Response Confidence is a statistical confidence of a true detection of a response, by default 99% (Fmp
3:1). It is indicated in the bar-view on the left side.
The Fmp is the result of the actual quality calculation of the highlighted curve. The Response Confidence is
specific quality characteristics derived from this Fmp number.
The relation between the Fmp and the Response Confidence is:
Response Confidence 99.0% = Fmp 3.10 There is only a 1% chance that the "response" is just noise.
Response Confidence 97.5% = Fmp 2.65 There is only a 2.5% chance that the "response" is just noise.
Response Confidence 95.0% = Fmp 2.25 There is only a 5% chance that the "response" is just noise.
The red curve and bar indicates the development of the Response Confidence over the course of the test.
The primary use is to see if the Response Confidence is reached. Also, if the curve grows steadily during the
test, it may be used as an indication of the relevance of extending the test time to allow the Response Confi-
dence to be met. For a quality reading well above the target, this curve will hit the ceiling of the display area
and continue as a flat line despite higher quality levels actually being present. When the Response Confi-
dence level is reached the bar will turn green with a checkmark (e.g. 99%, as shown in the figure in the be-
ginning of the section).
Note As the Fmp is based on statistical caluclation you may experience that the Fmp fluctates as the
recording processes, see above right picture.
For this reason there is a minium of 800 sweeps that must be collected before the test can be stopped by
either the Fmp or residual noise.
You may experience that the Fmp detects a waveform repsonse quicker than you may find the waveform
looking visually good. Should this be the case, uncheck the Fmp detection from the test protocol and use the
Fmp as guidedance.
Recorded (recorded sweeps)
The Fmp, Response Confidence, and the Residual Noise are calculated as the recording proceeds. The hor-
izontal scale therefore indicates the number of accepted sweeps entering the average. Rejected sweeps are
not counted.
range. The Fmp is the ratio between the response amplitude and
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