View-based modelling of human visual navigation errors

View-based and Cartesian representations provide rival accounts of visual navigation in humans, and here we explore possible models for the view-based case. A visual “homing” experiment was undertaken by human participants in immersive virtual reality. The distributions of end-point errors on the ground plane differed significantly in shape and extent depending on visual landmark configuration and relative goal location. A model based on simple visual cues captures important characteristics of these distributions. Augmenting visual features to include 3D elements such as stereo and motion parallax result in a set of models that describe the data accurately, demonstrating the effectiveness of a view-based approach.

Al-Qaeda - terrorists, hypocrites, fundamentalists? The view from within

This article investigates the ideology of Al-Qaeda as perceived from within the network. Particular attention is paid to the ideological background of Al-Qaeda's intellectual leadership, its sociopolitical context and the nature of its recruits. The inner logic of the Al-Qaeda organisation advances an intellectual concept that is not based on the main schools of Islamic theology, but on a new ideological starting point that results from the application of Islamic principles to sociopolitical change. With its political goals reinforced by the teachings of the Quran, exemplified by the content and rhetoric of a recently discovered training manual, the organisation creates powerful imagery embedded in the collective consciousness of the Muslim community. Thus, the message provided by Al-Qaeda inspires its followers to commit violent acts of destruction while being fully convinced that they are fulfilling the ordained will of Allah.