ACTIVITY MONITOR - Vanderbilt Kennedy Center

MED ASSOCIATES INC. ACTIVITY MONITOR
Item Description
Data Block Interval
Sec.
Data Blocks
Numeric
Box Size (beams)
min - 2
max – 8
Resting Delay (ms)
min - 50
max - 2000
Data may be analyzed as a series of time blocks. This feature is useful for
examining instantaneous values (1 sec) or larger to determine time sequenced or
event related values. A summary total of all of the data blocks is always provided
in the output data file. This interval is independent from the interval set in the
Experiment Configuration screen in that this value may be changed for each data
file re-analysis. The Experiment Configuration Block Interval is used only for
summary and print data.
The number of Data Blocks is established when the analysis time (entire session
or a portion there of as defined by the Start and End Time listed above) is broken
up by the Data Block Interval.
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
counted as a stereotypic movement.
Two, to "filter" movement data (Appendix IV).
Three, the Box Size 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.
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.
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. See Appendix IV.
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