Brainless Bodies: Controlling the Development and Behavior of Multicellular Animats by Gene Regulation and Diffusive Signals - supplementary materials

This page contains videos that supplement figures for the 13th International Conference on the Synthesis and Simulation of Living Systems (ALIFE XIII) paper by Michał Joachimczak, Taras Kowaliw, Rene Doursat and Borys Wróbel.
If you have any questions or comments, please don't hesitate to contact me (Michal): mjoach ( at ) gmail . com

Contents:

  1. Abstract
  2. Figure 4 videos
  3. Reference/BibTeX
  4. Previous work with the same system

1. Paper abstract

We present a model of parallel co-evolution of development and motion control in soft-bodied, multicellular animats without neural networks. Development is guided by an artificial gene regulatory network (GRN), with real-valued expression levels, contained in every cell. Embryos develop within a simulated physics environment and are converted into animat structures by connecting neighboring cells through elastic springs. Outer cells, which form the external envelope, are affected by drag forces in a fluid-like environment. Both the developmental program and locomotion controller are encoded into a single genomic sequence, which consists of regulatory regions and genes expressed into transcription factors and morphogens. We apply a genetic algorithm to evolve individuals able to swim in the simulated fluid, where the fitness depends on distance traveled during the evaluation phase. We obtain various emergent morphologies and types of locomotion, some of them showing the use of rudimentary appendages. An analysis of the selected evolved controllers is provided.



2. Figure 4 - example of evolved morphologies and motion strategies

The figure demonstrates a sample of obtained morphologies and locomotion types in the system. Note that the individuals were evolved only for their ability to move in a fluid. Neither their morphology nor the type of controller were externally enforced. Each individual develops from a single cell into its final morphology and each cell is controlled (both during developmental stage and locomotion stage) by activity of its gene regulatory network encoded in linear genome.



Fig. 4a The turtle strategy, an example of the use of appendages



Fig. 4b The shark strategy: the use of a tail fin for propelling



Fig. 4c The worm strategy: propelling with undulatory movements



Fig. 4d The jellyfish strategy: an exploitation of asymmetric contraction and expansion speed combined
with one blunt end (contractions are faster than expansions)



3. Reference/Bibtex

Joachimczak, M., Kowaliw, T., Doursat, R., and Wróbel, B. (2012). Brainless bodies: Controlling the development and behavior of multicellular animats by gene regulation and diffusive signals. In Adami, C., Bryson, D. M., Ofria, C., and Pennock, R. T., editors, Artificial Life XIII: Proceedings of the Thirteenth International Conference on the Simulation and Synthesis of Living Systems, pages 349-356, Cambridge, MA. MIT Press.
 PDF /  BibTeX /  RIS /   CiteULike


4. Related work on the system

Have a look at our first paper, in which cells were controlled by sine oscillators:

http://www.evosys.org/gecco12animats

as well as at our earlier work on the same model of gene regulatory network, applied to 3D development and patterning:

http://www.evosys.org

If you can't access the PDF, just e-mail me: mjoach (at) gmail . com


Last modified: May 2013, by Michał Joachimczak