# Nesting over Head directed to zone

Aim

To pick out the data collected when the head of the subject (or more subjects, named Actors) is pointing to a zone or a circular area around a point. The zone or point must be defined in the Arena Settings.

example Calculate the velocity of the subject every time it was pointing to the target zone.

Nesting vs. Nesting over Subjects

Notice the difference when there are multiple subjects in the same arena:

▪To select data of a subject based on when that subject points to a zone, choose Head directed to zone under Nesting. See the procedure below.

▪To select data of a subject based on when other subjects point to a zone, choose Head directed to zone under Nesting over subjects. There you find the Actors tab where you can specify which subjects (Actors) were pointing to the selected zone. See Nesting over subjects

Procedure

1.In the Data Profile, under Nesting click the button next to Head directed to zone.

2.In the Head Directed to Zone window, select:

▪The Zone of interest (a zone or a point of interest + a specific radius).

▪When to calculate the Head directed to zone state. Use this option to restrict the selection criterion (e.g. calculate Head directed to zone only when the subject was in an area around the target zone, not the entire arena).

For details about how Head directed to zone is calculated, see Dependent Variables in Detail > Head directed to zone.

3.Click OK. Proceed with step 4 in How to select track segments.

See also

▪Nesting over Subjects