The term now includes temporal properties of situations, or situation types.
By introduction of two units representing explicitly the Stance and Swing the physical properties of the situation can be exploited without requiring specific explicit phase-coupling of the joint controllers for each kinematic situation.
Second, progressive familiarisation of the animals with a novel environment resulting in apparently lower levels of motivation to explore did not appear to reduce the stressful properties of the situation as evaluated by ACTH release.
Suppose that the natural properties of some situation are completely specified.
We argue that behaviour is crucially linked to not only the preferences of people, but also the properties of the situation.
This is an example of a methodological use of symmetry properties: on the basis of the invariance properties of the situation under consideration (in this case, the dynamical problem in classical mechanics), a strategy is applied for deriving determinate consequences.
Since most actions do not affect most properties of a situation, in a domain comprising M actions and N properties we will, in general, have to write out almost MN frame axioms.
Only certain properties of a situation are relevant in the context of any given action, so the counter-argument goes, and consideration of the action's consequences can be conveniently confined to those.
As stated above, solutions to the logical frame problem developed by AI researchers typically appeal to some version of the common sense law of inertia, according to which properties of a situation are assumed by default not to change as the result of an action.
What we need, it seems, is some way of declaring the general rule-of-thumb that an action can be assumed not to change a given property of a situation unless there is evidence to the contrary.
