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. 2016 Jan 13;115(3):1446–1457. doi: 10.1152/jn.00283.2015

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Fig. 3. — Development of fictive swimming in later stage Xenopus tadpoles. Ai: completely isolated central nervous system (CNS) preparation at pro-metamorphic (48–62) larval stages with recording electrodes (at VR L12, R20). Aii: repetitive bouts of spontaneous fictive swimming. Shown below is an expanded excerpt of fictive swimming and method used to calculate the percentage of time spent active (see also at top). Other measured rhythm parameters within swim episodes, burst duration (BD), cycle period (CP) and episode duration (ED), are also indicated. B: bar graph illustrating the developmental increase in spontaneous fictive swim occurrence expressed as a mean percentage of time (over a 5-min period) that preparations were active. Values are means ± SE. *P < 0.05.