CinePlex v3 Manual - Plexon Inc

4
Tools menu, click Levels Editor (or click the Levels Editor button on the toolbar).
Level Interval Markers
Level Interval marker occurrences indicate the time intervals during which the
values of another Scalar marker satisfied some condition. The user may use the
Levels Editor to set up the conditions, apply the conditions to a specific Scalar
marker, and generate occurrences of the selected Level Interval marker or markers.
Level Interval markers are like Interval markers, but they are extended to store
additional information that defines a condition. This additional information
appears with the Level Interval marker definition in the CPJ file. The occurrence
of a Level Interval marker is always tied to the values of the occurrence of a Scalar
marker.
The condition for a Level Interval marker can be either one or two level settings,
which can include an above or below flag for each level, and when two levels are
used, a logical operator between them (AND or OR). For example, the user may
define a simple thresholding operation that generates the time intervals for which
the value of the Motion Scalar marker went below the value of 175. This definition
might be useful as a freezing behavior detector. For more information on
freezing behavior, see “Motion Measure Option” on page 81. The generated
Level Interval then represents the episodes during which the animal froze. The
preceding illustration shows the Levels Editor when such a Frozen Level Interval
186 CinePlex