In this short video we'll explore the difference between state behaviours and event behaviours in ethology.
Transcript:
Students often ask questions about the difference between an
event behaviour and a state behaviour in ethology. In this short video we’ll go
over some of the basics – remember Martin and Bateson’s Measuring Behaviour is
an excellent resource for more information.
Martin & Bateson said that events and states lie at
opposite ends of a continuum. This is a good way to think about it.
Think of this arrow as the amount of time you’re planning to
watch the animal for.
Events are the small behaviours that happen during this time.
It’s hard to count how long an event lasts for because it’s such a tiny
fraction of the overall time you spend observing the animal. Instead we count
how many events occur in a given period.
By contrast, states are bigger behaviours that happen in
this period. We could count how many states occur, but there might only be one
state, or very few states observed. Instead of counting how many states we see,
it makes more sense to count how long those states last for. We can then talk
about how long an animal spent in a particular state for that given period.
Some states can be what we call ‘mutually exclusive’. For
example when this cat is lying down, she cannot be standing up or sitting or in
locomotion. The lying behaviour is mutually exclusive. Most often we think
about postural behaviours as being mutually exclusive, but there can be others,
for example fighting and allogrooming. We often use modifiers in our ethogram,
for example here we might be interested in state behaviours, but interested in
what the tail is doing as a modifier.
In this ethogram, lying and standing are mutually exclusive
states, but tail swishing is a state that could be occurring during either a
lying or standing bout.
When creating your ethogram you’ll decide whether behaviours
are states or events, but when you pilot your data collection and use your
ethogram for the first time, you might decide to change a behaviour from a
state to an event, or vice versa, depending on the practical considerations of
data collection. It all depends on how
you’re recording that data.