The AI system NARS contains a categorization model, in the sense that categorization and reasoning are two aspects of the same mechanism. As a theory of categorization, the NARS model unifies several existing theories. In this paper, the logic used in NARS is briefly described, and the categorization model is compared with the others.

Previous research has demonstrated dissociations between categorization and recognition performance in amnesic patients, supporting the idea that separate memory systems govern these tasks. However, previous research has also demonstrated that these dissociations are predicted by a single-system model that allows for reasonable parameter differences across groups. Generally, previous studies ha...

We taught a novel animal category by rule-based and similarity-based processes to participants with Alzheimer's disease (AD), corticobasal degeneration (CBD), and healthy age-matched participants. Healthy participants successfully categorized by either process. AD patients' rule-based categorization was impaired, while their similarity-based categorization resembled that of healthy participants...

Are categorization and visual processing independent, with categorization operating late, on an already perceived input, or are they intertwined, with the act of categorization flexibly changing (i.e. cognitively penetrating) the early perception of the stimulus? We examined this issue in three experiments by applying different categorization tasks (gender, expressive or not, which expression a...

Most natural domains can be represented in multiple ways: we can categorize foods in terms of their nutritional content or social role, animals in terms of their taxonomic groupings or their ecological niches, and musical instruments in terms of their taxonomic categories or social uses. Previous approaches to modeling human categorization have largely ignored the problem of cross-categorizatio...

Dissociations between similarity and categorization have constituted critical counter-evidence to the view that categorization is similarity-based. However, there have been difficulties in replicating such dissociations. This paper reports three experiments. The first provides evidence of a double dissociation between similarity and categorization. The second and third show that by asking parti...

Abstract: Categorization forms a primary cognitive ability. Recent models/theories of categorization propose that there are multiple systems underlying this ability: an implicit learning system and an explicit, verbal, system. One successfull neurocomputational model of categorization is COVIS (Ashby, 1998), which is used to explain eg categorization deficits in Parkinson’s patients (Hélie, 201...

This paper examines the process of categorization in young children, and tests predictions derived from a model of young children’s similarity judgment. The model suggests that linguistic labels might have greater contribution to similarity judgment for younger children than do other attributes. It is argued that because categorization is based on similarity, the model predicting similarity jud...

How do people learn categories and what changes with development? The current study attempts to address these questions by focusing on the role of attention in the development of categorization. In Experiment 1, participants (adults, 7-year-olds, and 4-year-olds) were trained with novel categories consisting of deterministic and probabilistic features, and their categorization and memory for fe...