- For the line crossings,
you have to start again
at the start of the video,
and then start the collection of data
as soon as the animal
is placed in the arena.
Now this is the same animal
that I showed you before,
so you are gonna be a bit more
familiar with this animal.
The number of line crossings is a measure
of locomotor activity.
And as with the latency
to leave a central square
and the time spent in the central square,
four paws need to cross the line
to be counted as a line crossing.
So let's start the video,
and I will tell you whenever the animal
has crossed the line, I will say cross.
And so you get a good feel for
what I want you to look for.
All right, let's start the video.
All right, so the animal's
placed in the center,
and so you can now see it's in one square.
So as soon as it leaves or
crosses one of the lines
with its four paws, it is
called a line crossing.
And you can see that that is
a cross right now.
A cross, okay.
Cross, cross.
Cross, cross.
Cross, cross, cross, cross, cross.
Cross.
Cross, cross.
Cross, cross.
Cross.
Cross, cross, cross.
Now when the animal goes across
a crossing of the lines here,
just count it as one cross.
However, if it walks
from here and then here
or diagonally across like
that, it's two crosses.
We haven't seen that very
much with this animal.
Okay, cross.
Cross
Cross, cross, cross, cross.
Cross, cross, cross, cross.
And here it's not crossing really.
Cross, cross.
Cross, cross.
Cross, cross.
Cross.
Cross.
Cross.
And here we're almost at the end.
All right, that's it.
So I didn't keep a careful
tally of the number of crosses
because I wanted to indicate them to you,
but I think it's like 20
or 30 crosses in total,
maybe a bit more.
But anyway, so that is it.
So when it crosses like
this, it's one cross.
If it walks across like
this, it's two crosses.
If it goes over with two
paws and then turns around,
that's not a cross.
So I hope that clarifies
the locomotor activity.
And this will be the
last part of each video
that you'll be doing.
So good luck with that,
and I'm looking forward to your data.
