lesson 4.docx

# The best interpretation is one that provides the most

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The best interpretation is one that provides the most coherent account of what we want to understand. Coherence can be understood in terms of maximal satisfaction of multiple constraints, in a manner informally summarized as follows: 1. Elements are representations such as concepts, propositions, parts of images, goals, actions and so on. 2. Elements can cohere (fit together) or incohere (resist fitting together). Coherence relations include explanation, deduction, facilitation, association and so on. Incoherence relations include inconsistence, incompatibility, and negative association. 3. If two elements cohere, there is a positive constraint between them. If two elements incohere, there is a negative constraint between them. 4. Elements are to be divided into ones that are accepted and ones that are rejected. 5. a positive constraint between two elements can be satisfied either by accepting both of

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the elements or by rejecting both of the elements. 6. a negative constraint between two elements can be satisfied only by accepting one element and rejecting the other. 7. the coherence problem consists of dividing a set of elements into accepted and rejected sets in a way that satisfies the most constraints. Computing coherence is a matter of maximizing constraint satisfaction and can be approximately accomplished by several different algorithms. The most psychologically appealing models of coherence optimisation are provided in connectionist algorithms. These are neuron-like units to represent elements and excitatory and inhibitory links to represent positive and negative constraints. Coherence can be measured in terms of the degree of constraint satisfaction accomplished by the various algorithms .the computational problem of exactly maximizing coherence is very difficult, but there are effective algorithms for approximately maximising coherence in terms of constraint satisfaction (Thargad and Verbeurgt 1998) More exactly, deliberative coherence can be specified by the following principles: Principle 1: Symmetry- coherence and incoherence are symmetrical relations: if factor (action or goal) f1 coheres with factor f2, then f2 coheres with f1. Principle 2: Facilitation- consider actions A1…An that together facilitate the accomplishment of goal G. then (a) each A1 coheres with G, (b) each A1 coheres with each other Aj, and (c) the greater the number of actions required, the less the coherence among the actions and goals. Principle 3: Incompatibility- (a) if two factors cannot both be performed or achieved, then they are strongly incoherent. (b) if two factors are difficult to perform or achieve together, then they are weakly incoherent. Principle 4: goal priority- some goals are desirable for intrinsic or other non-coherence reasons. Principle 5: Judgement- facilitation and competition relations can depend on coherence with judgements about the acceptability of factual beliefs.
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