Presents an overview of this special journal issue which discusses the evaluation of computers in education, based on a workshop held in Scotland in January 1990. Evaluative methods in general are discussed, distinctions between evaluation and measurement are described, types of evaluation are explained, and the use of measuring instruments in…

Electronic Classroom is an Australian-developed software product that provides a shared screen facility between two to six Apple Macintosh computers using standard telephone lines and modems. It provides an icon-based "paint" interface with point and click switching of control between sites. Used in conjunction with an additional voice…

The mechanisms of perceptual learning are analyzed theoretically, probed in an orientation-discrimination experiment involving a novel nonstationary context manipulation, and instantiated in a detailed computational model. Two hypotheses are examined: modification of early cortical representations versus task-specific selective reweighting.…