Quantitative analysis of Hydra spontaneous contractile behavior. The animation explains the automatized video-recording of a freely behaving polyp and further analysis of the image sequence using a custom script to generate such metrics of the behavior as stretching and contractile capacity, contraction frequency and regularity.
Reference: Murillo-Rincon, A.P., Klimovich, A., Pemöller, E. et al. Spontaneous body contractions are modulated by the microbiome of Hydra. Sci Rep 7, 15937 (2017) doi:10.1038/s41598-017-16191-x