The role of different spatial frequency bands on face gender and expression categorization was studied in three experiments. Accuracy and reaction time were measured for unfiltered, low-pass (cut-off frequency of 1 cycle/deg) and high-pass (cutoff frequency of 3 cycles/deg) filtered faces. Filtered and unfiltered faces were equated in root-mean-squared contrast. For low-pass filtered faces reac...

Infant looking tasks are fruitful sources of data on infant cognition. Researchers using these tasks measure differential looking times as infants look at multiple stimuli. These looks are used to infer stimulus recognition and visual processing of familiar and novel stimuli. We propose here that looking behavior in two of these tasks, infant categorization and visual paired comparison, arise f...

A goal of epigenetic robotics is to design a control architecture that implements an ongoing, autonomous developmental process which is unsupervised, unscheduled, and taskindependent. The developmental process we are currently exploring contains three essential mechanisms: categorization, prediction, and intrinsic motivation. In this paper we describe a hybrid approach that uses Growing Neural ...

In this report I present a prototype system for use in dynamic text categorization research. The system implements lexical chaining, as described in recent literature. On top of this is built a simple extension to use for automatically identifying one or several categories to place a given text in. The initial tests presented in this report does not give any useful results, however, it give ris...

This paper presents an adaptive email categorization method developed for the Active Information Management component of the EU FASiL project. The categorization strategy seeks to categorize new emails by learning user preferences, with a feature-balancing algorithm that improves the data training effectiveness and with a dynamic scheduling strategy that achieves the system adaptivity. The resu...

Goal-directed behavior is the essence of adaptation because it allows humans and other animals to respond dynamically to different environmental scenarios. Goal-directed behavior can be characterized as the formation of dynamic links between stimuli and actions. One important attribute of goal-directed behavior is that linkages can be formed based on how a stimulus is categorized. That is, link...

Probabilistic conceptual network is a knowl­ edge representation scheme designed for reasoning about concepts and categorical abstractions in utility-based categorization. The scheme combines the formalisms of ab­ straction and inheritance hierarchies from artificial intelligence, and probabilistic net­ works from decision analysis. It provides a common framework for representing con­ ceptual k...

Most of the multimedia objects distributed over the WorldWide Web are unstructured or poorly meta-indexed to be of any use in retrieval tasks formulated by users in natural language queries. In general these dynamic multimedia objects are manually annotated in terms of textual documents. The high costs involved in manually indexing multimedia objects, which grow in volume and are becoming ever ...

To investigate the difficulties in communication, socialization abilities, and emotion perception deficits in individuals with autism spectrum disorders (ASD), we propose the project SARA. Its main goal is to assess how abstracted emotional facial expressions influence the categorization of the emotions by children and adolescents with highfunctioning ASD. This paper focuses on the first pilot ...