Self-organizing maps and generalization: an algorithmic description of Numerosity and Variability Effects
This work addresses the gap between computational and algorithmic levels in cognitive science, offering a biologically plausible alternative to Bayesian models for understanding generalization effects.
The paper tackles the problem of explaining the psychological mechanisms behind category generalization in human cognition by proposing self-organizing maps as a candidate model. It shows that these maps reproduce human behavior, specifically the Numerosity and Variability effects, without needing contrastive information.
Category, or property generalization is a central function in the human cognition. It plays a crucial role in a variety of domains, such as learning, everyday reasoning, specialized reasoning, and decision making. Judging the content of a dish as edible, a hormone level as healthy, a building as belonging to the same architectural style as previously seen buildings, are examples of category generalization. In this paper, we propose self-organizing maps as candidates to explain the psychological mechanisms underlying category generalization. Self-organizing maps are psychologically and biologically plausible neural network models that learn after limited exposure to positive category examples, without any need of contrastive information. Just like humans. They reproduce human behavior in category generalization, in particular for what concerns the well-known Numerosity and Variability effects, which are usually explained with Bayesian tools. Where category generalization is concerned, self-organizing maps are good candidates to bridge the gap between the computational level of analysis in Marr's hierarchy (where Bayesian models are situated) and the algorithmic level of aanalysis in Marr's hierarchy (where Bayesian models are situated) and the algorithmic level of analysis in which plausible mechanisms are described.