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Fig. 3. Yoked control data for adult and juvenile snails. Plotted are the number of
attempted pneumostome openings in the `pre' yoked training session and the
`post' yoked control-training sessions for both operantly conditioned (grey
bars) and yoked control (white bars) preparations. Also shown are the results
of operant training on the number of attempted pneumostome openings during the
course of training. The number of attempted openings in the `post' session 1 h
after the session 2 of both adult and juvenile snails did not significantly
decrease in the yoked control snails as it did for the snails that received
the operant conditioning training procedure.
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