An efficient retrieval of a relatively small number of relevant cases from a huge case base is a crucial subtask of Case-Based Reasoning (CBR). In this article, we investigate Case Retrieval Nets, a memory model for this task which is applicable in any domain with attribute-based case representations. The main idea is to apply a restricted spreading activation process in the case memory in orde...

The present study was an attempt to replicate and extend Brown's (1979) finding of inhibition in retrieval from semantic memory produced by presentation of semantically related primes. Subjects' speed and accuracy in answering generalknowledge questions (e.g., Who was the first man to walk on the moon?) were measured when the question was preceded by one of four different prime types: neutral (...

We study the diffusive logistic equation with a free boundary in higher space dimensions and heterogeneous environment. Such a model may be used to describe the spreading of a new or invasive species, with the free boundary representing the expanding front. For simplicity, we assume that the environment and the solution are radially symmetric. In the special case of one space dimension and homo...

Models of automatic priming of word identification can be divided into those based on associative relations (e.g., spreading activation) and others based on semantic similarity (e.g., distributed models). In three experiments, associative relatedness was manipulated by presenting asymmetrically associated word pairs in both their forward and backward directions. Priming was comparable in both d...

s International, 48, 3025B, Doctoral dissertation, Yale University, 1986. HENDLER, J. 1986. Integrating marker-passing and problem-solving: A spreading-activation approach to improved choice in planning, Dissertation Abstracts International, 47, 2059B, Doctoral dissertation, Brown University. HOFSTADTER, D. R. 1995. Fluid Concepts and Creative Analogies: Computer Models of the Fundamental Mecha...

We report on the design of a system that enables the user to perform retrieval of items of interest both by browsing an automatically constructed very large hypertext and by spreading activation on the hypertext network itself. It is this second option that is particularly interesting since it enables the user to retrieve items that have not been visited, but that are similar to items flagged a...

The cognitive modeling community is presently divided between two different approaches to the spread of activation through networks. One school holds that symbolic information must be progagated, the other that numeric weights are used and activation spreads in a more analog manner. In this paper we describe a mechanism which allows the two processes to be merged via the introduction into the s...

This paper presents Nootropia, a self-organising information agent, capable of evaluating documents according to a user’s multiple and changing interests. In Nootropia, a hierarchical term network that takes into account term dependencies is used to represent a user’s multiple topics of interest. Non-linear document evaluation is established on that network based on a directed spreading activat...