User`s manual

Cerebus® User’s Manual
Revision 13.00 / LB-0028 Page 44
and draw an ellipse in the Pattern view around the cluster that you would like to define as a spike. You may also
change the size of the ellipse to make the diameter larger or smaller. Once the ellipse is placed in the cluster that you
are defining, the word “Overridden” will appear next to the sorted unit. You can also change the threshold radius by
changing the diameter of the grey ellipse in the center of the Pattern Display. Any units that occur in the grey circle
will not be displayed as a spike.
3D PCA On-line Spike Classification: If manual PCA is selected, spike sorting is performed using online PCA
analysis within the PCA space. PCA spike sorting can classify up to five different signals per channel, each selected
signal receives a separate color. An ISI Histogram is also displayed for each classified spike.
A user can sort an individual channel by clicking on the Pattern. Click the Define button next to the classified spike
to sort that unit. Hold the Ctrl key and draw around the cluster. An ellipsoid will be created which is used to define a
unit. You may also change the size of the ellipsoid by pressing R then moving the handle.
Hoops Spike sorting: If Hoops spike sorting is selected, you can click on Define (not shown above) next to each unit
window box. A color box will appear in the spike window. Drag the box to place a hoop anywhere on the screen so
that spikes go through that hoop. Any spike going through the hoop will be classified as that unit. Multiple hoops
can be placed and only spikes that go through all hoops will be classified.
Unit Mapping: Another override option can be performed by clicking the unit-mapping button. Rules can be
remapped, combined, or classified as noise.