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ALIFE
2005
13 years 5 months ago
Evolution of DNA Uptake Signal Sequences
The DNA of some naturally competent species of bacteria contains a large number of evenly distributed copies of a short sequence. This highly overrepresented sequence is believed t...
Dominique Chu, Hoong-Chien Lee, Tom Lenaerts
ALIFE
2005
13 years 5 months ago
Agency in Natural and Artificial Systems
We analyze the conditions for agency in natural and artificial systems. In the case of basic (natural) autonomous systems, self-construction and activity in the environment are two...
Alvaro Moreno, Arantza Etxeberria
ALIFE
2005
13 years 5 months ago
Flexible Couplings: Diffusing Neuromodulators and Adaptive Robotics
Recent years have seen the discovery of freely diffusing gaseous neurotransmitters, such as nitric oxide (NO), in biological nervous systems. A type of artificial neural network (A...
Andrew Philippides, Phil Husbands, Tom Smith, Mich...
ALIFE
2005
13 years 5 months ago
Levels of Description: A Novel Approach to Dynamical Hierarchies
We present a novel formal interpretation of dynamical hierarchies based on information theory, in which each level is a near-state-determined system, and levels are related to one ...
Simon McGregor, Chrisantha Fernando
ALIFE
2005
13 years 5 months ago
Modular Interdependency in Complex Dynamical Systems
Hierarchical modularity is a familiar characteristic of a large class of natural dynamical systems. A normal interpretation of modularity is that interactions between subsystems a...
Richard A. Watson, Jordan B. Pollack