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Journal of Experimental Biology 92,323-331 (1981)
Published by Company of Biologists 1981

The Effect of Filming Speed on the Interpretation of Arthropod Locomotion

T. M. WARD ¹ and W. F. HUMPHREYS ²

¹ School of Biological Sciences, Bath University Bath, Avon BA2 7AY, England
² School of Biological Sciences, Bath University Bath, Avon BA2 7AY, England; Western Australian Museum, Francis Street, Perth, W.A. 6000, Australia

Films of spider locomotion taken at about 270 frames per second (f.p.s.) were reanalysed to give effective filming speeds of 100, 50 and 25 f.p.s. Reanalysis of the data shows that mean values and variance for phase lag, period, stepping frequency and protraction/retraction ratios depart from the control values (270 f.p.s.) at slower sampling rates. Guidelines are presented for filming arthropod locomotion with high stepping frequencies and high or low p/r ratios. Most film analysis of arthropod locomotion has had insufficient time resolution to examine resolution-sensitive parameters such as the p/r ratio. Filming speeds giving sampling rates greater than 40 frames per step do not increase accuracy.

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