ACTIVITY MONITOR - Vanderbilt Kennedy Center

MED ASSOCIATES INC. ACTIVITY MONITOR
Resolution (ms)
min - 25
max – 250
The Experiment Configuration screens require the following information:
Table 3-6 - Experiment Configuration Information
Item Description
Box Size (beams)
min - 1
max – 8
Resting Delay (ms)
min - 50
max - 2000
The rate that the Activity Monitor acquires the data from the test chambers. This rate is
user-definable to enable variable data acquisition rates; thus, minimizing file size, or
maximizing resolution, depending upon the type of data sought and the size of the hard
drive. Larger data files require more disk space and longer analysis times. This rate is
automatically set to 33 1/3 ms when using the Video Tracking Interface system.
This setting is a vestige of days gone by when hard disk size and memory were limiting
factors. It is recommended that 50 ms or less be used if using a new computer with
plenty of disk space.
Box size serves three primary functions:
One, to delineate the maximum area that a subject may move within, and after the
Resting Delay (ms) criteria has been met (below), to have each movement measures as a
Stereotypic Count. If stereotypic is the primary measure, the size of the Box should be
set to the maximum distance that the stereotypic behavior would attain without leaving
(i.e. grooming could use a Box Size of 2 or 3 and head weaving could use a Box Size of 3
or 4).
Two, to "filter" movement data so that distance-traveled measures do not include
"bouncing" or "flickering" artifacts.
Three, the Box Size, Ambulatory Trigger and Resting Delay settings combine to create
a threshold whereby a subject must move a certain distance (Box Size) in a maximum
amount of time (Resting Delay) to maintain its ambulatory status. This is actually a
method to define large (ambulatory/quick) and small (stereotypic/slow) movements. See
Appendix IV. Standardized settings are not available, but would be dependent upon the
application being used (ataxic vs. non-ataxic subjects) and the strain of mice being
studied.
Box size can be changed in Data Analysis.
The Resting Delay is the amount of time the subject has to pass through the box (above)
to maintain its ambulatory status, or to make another ambulatory movement after the last
ambulatory movement. See Appendix IV.
Resting Delay can be changed in Data Analysis.
Ambulatory Trigger The number of beam breaks, after leaving the box, necessary to initiate an ambulatory
episode and to have the ambulatory distance considered in the Velocity measure.
Session Type (C, S) Select "C" for a Continuous session. Select "S" for a Segmented session. If a Segmented
session is chosen, the configuration screen changes.
Session Time (min) The amount of time for the session to run.
Block Interval (sec.) The size of the Blocks (time bins) that the data are to be broken down into in the
summary data files and the data that will be sent to the printer.
This may be changed in Data Analysis.
Compressed File Name of the ZIP file to store the raw data. If an extension is given, it will be ignored.
See Appendix I. See Appendix V for multiple users and *.ZIP files.
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