Table 1.

Intersegmental phase lags between M7 and M14 before and after transection of the nerve cord in freely swimming leeches determined from video analysis (n = 5 swim episodes for each preparation)

Preparation	1	2	3	4	5	Pooled data
Intact (mean ± SD)	134  ± 10.0°	142  ± 2.7°	138  ± 11.0°	152  ± 9.7°	167  ± 9.1°	147  ± 13.2°
SNC (mean ± SD)	154  ± 5.2°	149  ± 3.9°	174  ± 4.0°	185  ± 19.7°	190  ± 8.3°	170  ± 18.2°
Difference	20°	7°	36°	33°	23°	23°
Probability	<0.002	<0.002	<0.002	<0.002	<0.002	<0.002