Auteurs : Yagmur Denizhan http://popups.uliege.be/3041-539x/index.php?id=946 Publications of Auteurs Yagmur Denizhan fr 0 Advantages of Hierarchical Organisation in Neural Networks http://popups.uliege.be/3041-539x/index.php?id=2330 Artificial neural networks, which are inspired by the structure and functioning of the vertebrate-brain, are powerful modelling tools. However, the black-box representation they provide does not allow the usage of the huge accumulation of theoretical knowledge on system dynamics. Similarly, they also do not seem to provide any clue for the symbolic operations typical for the higher functioning mode of the human brain. In this study a "chaos control" problem is used as a test case to demonstrate the viability of extracting an analytical model from an artificial neural network. The results are used to comment on the advantages of hierarchical organisation not only in artificial but also natural neural networks. Thu, 01 Aug 2024 14:02:49 +0200 Thu, 01 Aug 2024 14:03:24 +0200 http://popups.uliege.be/3041-539x/index.php?id=2330 The Non-Decreasing Character of Complexity : A Biological Approach http://popups.uliege.be/3041-539x/index.php?id=942 The overall information processing capacity of an organism is proposed as a conceptual criterion for its complexity. The apparent tendency of complexity increase during the course of evolution is accounted for in terms of positive feedback mechanisms. Furthermore, the different modes of evolution of biological complexity are identified as: The ongoing appearance of more complex species in case of abundance of resources, pausing of the complexity increase when the limits of the resources are reached in a relatively isolated environment, and the extinction of some of the complex species due to lack of sufficient resources. All arguments concerning the definition of complexity and its non-decreasing character are based on concepts like information processing, maintenance of organisation and the related energy expenditures. As a result of these arguments it is concluded that complex adaptations have a teleonomic nature. Mon, 01 Jul 2024 14:56:01 +0200 Mon, 01 Jul 2024 14:56:13 +0200 http://popups.uliege.be/3041-539x/index.php?id=942