# Activity

Definition

The dependent variable Activity is only available when you selected Activity analysis in the Experiment Settings and you track only one subject per arena. Activity gives the percentage changed pixels in the entire arena between current sample and previous sample.

Calculation

See step 1 and 2 in Activity state for information on how this percentage of changed pixels is calculated. With the dependent variable Activity state, you can calculate how much time and how often your subject was inactive, moderately active and active and highly active. With the dependent variable Activity, you can calculate the average activity of your subject.

How to specify Activity

1.Click the Add button next to Activity.

2.Under Outlier filter, select the Averaging interval. This is the number of samples over which the running average mobility is based. The default value is 1, that is, the current value of Activity is only based on the current image. See Averaging interval

See Activity state for more information.

3.Complete the procedure to add the variable. See Calculate statistics: procedure.