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Item Levels of Detail for Crowds and Groups(Blackwell Publishers, Inc and the Eurographics Association, 2002) O'Sullivan, C.; Cassell, J.; Vilhjalmsson, H.; Dingliana, J.; Dobbyn, S.; McNamee, B. and Peters, C. and Giang, T.Work on levels of detail for human simulation has occurred mainly on a geometrical level, either by reducing the numbers of polygons representing a virtual human, or replacing them with a two-dimensional imposter. Approaches that reduce the complexity of motions generated have also been proposed. In this paper, we describe ongoing development of a framework for Adaptive Level Of Detail for Human Animation (ALOHA), which incorporates levels of detail for not only geometry and motion, but also includes a complexity gradient for natural behaviour, both conversational and social.ACM CSS: I.3.7 Three-Dimensional Graphics and Realism-AnimationItem Synthetic Vision and Memory for Autonomous Virtual Humans(Blackwell Publishers, Inc and the Eurographics Association, 2002) Peters, C.; O'Sullivan, C.A memory model based on 'stage theory', an influential concept of memory from the field of cognitive psychology,is presented for application to autonomous virtual humans. The virtual human senses external stimuli througha synthetic vision system. The vision system incorporates multiple modes of vision in order to accommodate aperceptual attention approach. The memory model is used to store perceived and attended object information atdifferent stages in a filtering process. The methods outlined in this paper have applications in any area wheresimulation-based agents are used: training, entertainment, ergonomics and military simulations to name but afew.ACM CSS: I. 3.7 Computer Graphics-Virtual reality