User`s manual

Cerebus® User’s Manual
Revision 13.00 / LB-0028 Page 35
Auto Thresholding
This window allows the user to specify the auto thresholding properties for spike detection.
Figure 31 - Auto Thresholding Properties
o Threshold Multiplier: The signal is filtered between 1-5 kHz (2
nd
-order Butterworth) for spike detection and the noise
in that band is estimated. The signal value has to cross the average noise times the Threshold Multiplier. This value
should typically be between 2.0 and 3.0.
o X,Y,Z dimensions of the noise ellipsoid: Radius of the Noise Ellipsoid in the feature space along each axis. This
parameter can also be set graphically by dragging the outside of the ellipsoid in the feature space view of the analog
properties window.
o X,Y,Z center location of the noise ellipsoid: The center point of the Noise Ellipsoid along the X, Y, and Z axis. This
parameter can also be set graphically by dragging the center of the ellipsoid in the feature space view of the analog
properties window.
o X,Y,Z axis rotation of the noise ellipsoid: The rotation angle of the Noise Ellipsoid along each axis. This parameter can
also be set graphically by dragging the rotation handles of the ellipsoid in the feature space view of the analog
properties window.
o Reset to Default: Pressing this button will reset the X,Y,Z values above to default for all channels.
o Apply to All: Pressing this button will apply the X,Y,Z values above to all channels.