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World class computing and information science research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.

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Prospective guidance in a free-swimming cell

Delafield-Butt, Jonathan and Pepping, Gert-Jan and McCaig, Colin and Lee, David (2012) Prospective guidance in a free-swimming cell. Biological Cybernetics, 106 (4-5). pp. 283-293. ISSN 0340-1200

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Abstract

A systems theory of movement control in animals is presented and applied to explaining the controlled behaviour of the single-celled Paramecium caudatum in an electric field. The theory – General Tau Theory – is founded on three basic principles: (i) all purposive movement entails prospectively controlling the closure of action-gaps (e.g. a distance gap when reaching, an angle gap when steering); (ii) the sole informational variable required for controlling gaps is the relative rate of change of the gap (the time derivative of the gap size divided by the size), which can be directly sensed; and (iii) coordinated movement is achieved by keeping the relative rates of change of gaps in constant ratio. The theory is supported by studies of controlled movement in mammals, birds, and insects. We now show for the first time that it is also supported by single-celled paramecia steering to the cathode in a bi-polar electric field. General Tau Theory is deployed to explain this guided steering by the cell. This presents the first computational model of prospective perceptual control in a non-neural, single-celled system.