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Computational sociology models social phenomena using the concepts of emergence and downward causation. However, the theoretical status of these concepts is ambiguous; they suppose too much ontology and are invoked by two opposed sociological interpretations of social reality: the individualistic and the holistic. This paper aims to clarify those concepts and argue in favour of their heuristic value for social simulation. It does so by proposing a link between the concept of emergence and Luhmann's theory of communication. For Luhmann, society emerges from the bottom-up as communication and he describes the process by which society limits the possible selections of individuals as downward causation. It is argued that this theory is well positioned to overcome some epistemological drawbacks in computational sociology. [ABSTRACT FROM AUTHOR]

This paper considers the application of Foucauldian perspectives within sociology. While Foucault's epistemology has generated novel historical and philosophical interpretations, when transposed to sociology, problems arise. The first of these concerns the association of knowledge and power, and the concept of 'discourse'. Foucault suggested that there are 'rules' of discursive formation which are extraneous to the 'non-discursive' realm of 'reality'. This formulation is consequently both deterministic and incapable of supplying explanations of why some practices become discursive which others do not. This determinism is reflected in some sociological analyses of embodiment, offering a model of the 'body' which is passive, and incapable of resisting power/knowledge. Secondly, Foucault's notion of the 'self' moves to the other extreme, inadequately addressing the constraints which affect the fabrication of subjectivity. Sociological accounts do not always recognize the ambiguities which consequently result from efforts to use Foucauldian positions. It is argued that post-structuralists other than Foucault may offer more to sociology. [ABSTRACT FROM AUTHOR]