# Rear

Definition

A discrete (state event) variable that is scored when the focal subject stands only on its hindlimbs and raises its head above its body. Two categories are defined:

▪Rear alone: the subject is not in contact with any other subject.

▪Rear in contact: the subject rears while in contact with another subject.

Calculation

EthoVision XT considers the samples when the focal subject's nose point is at least 40 mm higher than its tail base.

▪Rear in contact is scored when rearing overlaps with any event of type Contact scored for the focal subject.

▪In all other cases, Rear alone is scored.

How to specify Rear

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

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

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

Note

Note the differences between Rear in Live Mouse Tracker and Rearing in Behavior Recognition:

▪Rear in Live Mouse Tracker is detected using 3D data obtained from the depth camera, while Rearing in Behavior Recognition is detected using features of the pose extracted from a series of 2D images.

▪Rear in Live Mouse Tracker does not distinguish between rearing at the wall and rearing unsupported.

▪Rear in Live Mouse Tracker with multiple subject in the arena, while Rearing in Behavior Recognition only works with one subject at a time.

See also

▪Setting up Behavior Recognition

▪Behavior Recognition: Requirements

▪Analysis of Behaviors detected with Behavior recognition

▪Dependent variables for Live Mouse Tracker