A simulation study by B. D. Wright and G. A. Douglas is critiqued, which indicates that the unconditional maximum likelihood method is an appropriate substitute for the theoretically superior conditional method for estimating parameters of the Rasch model. The study appears to rest on inadequate logic. (TJH)

Describes exploratory experiments in evaluating and improving a thesaurus through studying its effect on retrieval. A formula was developed to measure the conceptual distance between queries and documents encoded as sets of thesaurus terms. Comparison to the performance of people judging conceptual distance shows that the formula accurately…

The theoretical approaches taken by the LOGIST and BILOG computer programs for estimating the parameters of the three-parameter logistic item response model, and their practical consequences, are compared. Guidelines for choosing between the programs for particular applications are offered. (SLD)

Presents the theory behind the mechanics demonstration that involves projecting a ball vertically upward from a ballistic cart moving along an inclined plane. The measured overshoot is believed to be due, in part, to the presence of rolling friction and the inertial properties of the cart wheels. (JRH)

Large-sample standard errors of linear equating for the counterbalanced design are derived using the general delta method. Computer simulations found that standard errors derived without the normality assumption were more accurate than those derived with the normality assumption in a large sample with moderately skewed score distributions. (SLD)

Explores the relationship between virtual reality (VR) stimulation and perceptual equivalence. Topics include perceived realism; creating a virtual illusion; displayed realism; and VR as an instructional technology. (Author/AEF)

Examples of two theory-based computerized learning systems--Smithtown and Sherlock--show that most success arises when learning tasks are well structured. Such systems teach procedural rather than conceptual knowledge and support individualized learning better than group learning. (SK)

The participation of the hippocampus in classical conditioning is described in terms of a multilayer network portraying stimulus configuration. A model of hippocampal function is presented, and computer simulations are used to study neural activity in the various brain areas mapped according to the model. (SLD)

Provides brief descriptions of interactive tutorial and simulation programs for reading, writing, and mathematics; and of drill-and-practice courseware packages. (DMM)

Describes an empirical exploration of the instructional potential of virtual reality as an interface for simulation-based training. Shows that subjects learned spatial-procedural and spatial-navigational skills in virtual reality. (SR)

To solve an applied research problem with bipolar data, a set of equations was developed that combined all plus and minus data combinations into unique values and scale points. The equations were tested through computer simulations and empirical tests. Resulting index scores were approximately interval and linear and easy to use and interpret.…

Monte Carlo simulations were used to examine three cases using analyses of variance (ANOVAs) sequentially. Simulation results show that Type I error rates increase when using ANOVAs in this sequential fashion, and the detrimental effect is greatest in situations in which researchers would most likely use ANOVAs sequentially. (SLD)

Describes a computer-based connectionist-type network model that correctly identified the gender of a set of French nouns, relying solely on information inherent in the nouns' structures, in the absence of explicit rules for evaluating nouns, through discovering criterial gender-specific features through examples of masculine and feminine nouns.…

Examines how computer-based simulations can best be exploited for computer-assisted language learning. Three learning environments are discussed: (1) the classroom, (2) a computer lab, and (3) self-access. Various types of computer-based simulations are described, including sports, adventure games, management of resources, and branching stories.…

The relationship between recognition and recall, especially the orderly recognition-failure function relating recognition and the recognizability of recallable words, was investigated using a composite holographic associative recall-recognition memory model (CHARM) in 10 series of computer simulations. Support for the model is demonstrated. (SLD)