Fig. 5. Effects of sodium nitroprusside (SNP) on semi-intact preparations (N=3). Video analysis of swimming in semi-intact preparations was correlated with motoneuron bursting recorded from the brain of the same animal. After the addition of SNP, the period of motoneuron bursting and actual swimming increased significantly from control levels (t-test, P<0.05). In the single preparation that remained viable long enough, a 5-min wash in seawater resulted in a return to a normal swim period. Values are means ± S.E.M. Asterisks indicate a significant difference from control values.
