Table 2.

Phase lags and swim cycle periods in three different types of preparations (n = 5 individuals for each type)

	Isolated nerve cords	Intact animals	SNC preparations
Phase lag per segment (mean ± SD)	10.1  ± 0.56°	13.8  ± 2.48°	20.3  ± 4.40°
Range of phase lags	9.4–10.9°	9.9–15.8°	13.0–23.2°
Swim cycle periods	0.7–0.9 sec	0.4–0.7 sec	0.4–0.7 sec