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Fig. 9. Resetting the phase of swimming by stimulating sint2. (Top) An
intracellular recording from Lsint2 during swimming; (bottom) a
record of the animal's movements. The movement detector saturated and did not
report the full range of side-to-side movement in this example.
Hyperpolarizing current sufficient to silence the cell was applied
via the recording electrode during the time indicated by the bar
under the voltage recording. The time of maximal right flexion (shown by
vertical lines above the behavior record) was measured during the 10 cycles
preceding the onset of the stimulus in order to calculate the mean ±
S.D. of the swimming period. These values were projected forward in
time to predict the expected time of occurrence of maximal right flexion The
bars and vertical lines above the behavioral record show the predicted time of
occurrence of peak right flexion after the stimulus ends. Horizontal tics show
the S.D. The difference between the predicted time of occurrence
and the actual occurrence of peak flexion provides a measure of phase
resetting. This experiment was repeated 15 times in three different whole
animal preparations with consistent results.
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