Presence and copresence have been key goals of researchers and developers of shared virtual environments. Much research has assumed that the two reinforce each other; that is, an enhanced sense of presence enhances copresence and vice versa. In this essay we question this assumption, and provide some examples in which users experience high presence and low copresence and the opposite. Although ...

Human movement in virtual environments (VEs) is a largely unstudied area, and there are no well-established methods of measuring it in VEs. Consequently, it is unclear how movement affects the experiential side of VEs. We introduce a novel method of measuring and modelling human movement. A specific information entropy-based modelling method enabled us to identify different movement patterns an...

The analysis of agency, a very close concept to presence, is of great help for acquiring insights into how the sense of presence is acquired in the developing child and also about the experience of presence itself. Empirical evidence coming from Cognitive Developmental Research together with the positive outcome of people with autism (who are not generally able to act “as if”) when participatin...

there are various approaches for depth estimation of anomalous potential field data. spectral analysis of gravity and magnetic data has been used extensively for many years to derive the depth to certain geological structures, such as the magnetic basement or the curie temperature isotherm. the interpretation of the gravity and magnetic data is preferred in frequency domain because of simple re...

Reply to Anonymous Referee #1 Let me start by thanking the referee for his/her constructive comment and suggestion that have led to clear improvments in the manuscript. Below, please find a reply to the comment (reproduced in part in italics). Specific comments My lone concern comes in the attribution of the deviations from normal in radar scan data above the wind turbines to anomalous propagat...

In this paper, we present an algorithm for the automated removal of nonprecipitation related echoes such as atmospheric anomalous propagation (AP) in the lower elevations of meteorological-radar volume scans. The motivation for the development of this technique is the need for an objective quality control algorithm that minimizes human interaction. The algorithm uses both textural and intensity...

Collaborative Virtual Environments (CVEs) that can be simultaneously shared by a number of participants located in different geographical locations, provide new possibilities for communication and collaboration, with a lot of potential for the way we work and exchange information. However, in order for such systems to be successful they need to provide the participants with a compelling experie...

A computer-controlled test of colour vision is described, in which luminance noise and masking contours are used to ensure that the subject's responses depend on chromatic signals. The test avoids the need--common to most computer-controlled tests--to define equiluminance for the individual subject before the colour test itself can be administered. The test achieves a good separation of protan ...