Although maintaining situation awareness (SA) is a critical skill for many complex tasks, there have thus far been few rigorous computational approaches to modeling SA behavior and performance. We developed a preliminary computational model of SA focused on remembering the locations of static objects in the visual field. We built this model on the foundation of the ACT-R cognitive architecture,...

This study extends classical models of spreading epidemics to describe the phenomenon of contagious public outrage, which eventually leads to the spread of violence following a disclosure of some unpopular political decisions and/or activity. Accordingly, a mathematical model is proposed to simulate from the start, the internal dynamics by which an external event is turned into internal violenc...

W ILKES B A R R E, Pa. (U P I) H ubert H. H um phrey , barnsto rm ing th rough vote-rich Pennsylvania, called R ichard M. N ixon a liar yesterday and w arned th e nation it can tru st neither th e G O P cand ida te nor G eorge C. W allace. In stops in Erie, W ilkes B arre and S cran ton , H um phrey flayed N ixon and W allace—attack ing hes o p p o n en ts w ith equal en thusiasm and v ig o r-a...

The current study used the Space Fortress game (Donchin, 1989) to study the effects of training and instruction in acquisition of complex skills. The game requires flexible coordination of perceptual, cognitive and motor components in a dynamically changing environment. We examined whether effective instruction can be developed for such a task in the same way that instruction is developed for a...

This paper presents results from a number of exible vocabulary recognition experiments on the Norwegian SpeechDat(II) database. A common phoneme-based recogniser design procedure is tested on ve di erent tasks, and for ve di erent training sets. Results verify that reasonably accurate recognisers can be built with the database, using standard HMM techniques. They also quantify the importance of...

A cognitive model[7] is implemented in ACT-R 6.0 [1] to demonstrate how modeling can help us understand better not only how our attention system works but also explain how it functions in a coordinated way to produce effective behavior. A Cognitive Model of Modulation between Attentional Networks Fehmida Hussain and Sharon Wood. ([email protected], [email protected]) Representation and C...

This paper presents a study of the effect of working memory load on the interpretation of pronouns in different discourse contexts: stories with and without a topic shift. We present a computational model (in ACT-R, Anderson, 2007) to explain how referring subjects are used and interpreted. We furthermore report on an experiment that tests predictions that follow from simulations. The results o...

The computational model in present paper confirms that memory-based accounts are sufficient to account for a high rate of success at first-pass referent retrieval for anaphoric (and non-anaphoric) nouns. Because even definite noun phrases can often be non-anaphoric (e.g., Poesio & Vieira, 1998), an adequate model must account for how a reader makes an explicit or implicit decision about the ana...

Efficient query processing in P2P systems poses a variety of challenges. As a special problem in this context we consider the evaluation of rank-aware queries, namely top-N and skyline, on structured data. The optimization of query processing in a distributed manner at each peer requires locally available statistics. In this paper, we address this problem by presenting approaches relying on the...

Spatial databases typically assume that the positional attributes of spatial objects are precisely known. In practice, however, they are known only approximately, with the error depending on the nature of the measurement and the source of data. In this paper, we address the problem how to perform spatial database operations in the presence of uncertainty. We first discuss a probabilistic spatia...