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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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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.