4.5 Globalist versus Localist Representations 89 SchemaNodes in the Atomspace action selection process rapidly decreases in most cases local workspaces bubbles of interlinked Atoms with moderate impor- ro eae in Chapter 19 of Part 2) for a period of time senses Atoms indexed in sensory memory Table 4.1: CogPrime Analogues of Key LIDA Features Each demand is assumed to come with a certain “target level” or “target range” (and these may fluctuate over time, or may change as a system matures and develops). An Urge is said to develop when a demand deviates from its target range: the urge then seeks to return the demand to its target range. For instance, in an animal-like agent the demand related to food is more clearly described as “fullness,” and there is a target range indicating that the agent is neither too hungry nor too full of food. If the agent’s fullness deviates from this range, an Urge to return the demand to its target range arises. Similarly, if an agent’s novelty deviates from its target range, this means the agent’s life has gotten either too boring or too disconcertingly weird, and the agent gets an Urge for either more interesting activities (in the case of below-range novelty) or more familiar ones (in the case of above-range novelty). There is also a primitive notion of Pleasure (and its opposite, displeasure), which is consid- ered as different from the complex emotion of “happiness.” Pleasure is understood as associated with Urges: pleasure occurs when an Urge is (at least partially) satisfied, whereas displeasure occurs when an urge gets increasingly severe. The degree to which an Urge is satisfied is not necessarily defined instantaneously; it may be defined, for instance, as a time-decaying weighted average of the proximity of the demand to its target range over the recent past. So, for instance if an agent is bored and gets a lot of novel stimulation, then it experiences some pleasure. If it’s bored and then the monotony of its stimulation ge