# Stop

Definition

A discrete (state event) variable that marks the time that the focal subject’s center point moves little or not at all in space.

Two categories are defined, based on whether the subject is in contact with other subjects or not.

Calculation

1.EthoVision XT finds all the events of type Stop in the Live Mouse Tracker database. These are scored when the speed of the subject is lower then the threshold value (5.26 cm/s or 2 5/64 in). This threshold is set in the Live Mouse Tracker algorithms and cannot be changed.

2.EthoVision XT finds the events of type Contact in the Live Mouse Tracker database.

3.If the event Stop and Contact overlaps, then Stop in contact is scored for that sample. In all the other cases, Stop alone is scored.

How to specify Stop

1.Open an Analysis profile and in the Dependent Variables panel, under Live Mouse Tracker, click the Add button next to Stop.

2.Under Calculate Statistics for, select Stop alone, Stop in contact, or both.

3.Click the Receivers tab. This applies if you selected Stop in contact in the previous step.

Under Select, choose the subjects that the focal subject was in contact with while it was not moving. If you select two or more subjects, select one of the available options from the list:

▪All selected subjects: Stop in contact is scored when the focal subject was in contact with all the subjects selected above simultaneously.

▪Any selected subject: Stop in contact is scored when the focal subject was in contact with any of the subjects selected above.

▪Each subject: Stop in contact is scored when the focal subject was in contact with one of the subjects selected above. The results are displayed for each Receiver.

4.Complete the procedure to add the variable to the Analysis profile. See Calculate statistics: procedure

Notes

▪The state Not moving, which you can find in the EthoVision XT dependent variable Movement, is similar to Stop. However, there are differences:

▪You can set the speed thresholds for Not moving, not for Stop.

▪Instances of Not moving cannot be split based on the events of contact with other subjects.

▪In the Trial Statistics results table, with the default layout, the results of Stop are shown per subject (on the rows). When choosing Stop in contact, the columns vary depending on what you chose in the Receivers tab (see above).

▪If you chose Each subject, the columns contain the statistics of Stop in contact with specific subjects (for example, Stop in contact with A to D).

▪If you chose All selected subjects or Any selected subject, a column With all of A, B, C, D or With any of A, B, C, D contains cumulative statistics of Stop in contact when the subject was in contact with all the cage mates simultaneously or with any of them, respectively, depending on which option you chose.

See also

▪Live Mouse Tracker > Move

▪Movement