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Fig. 3. Controls for the KCl bath experiments. Top, snails (N=19) that
were placed in pond water (PW) rather than the KCl bath before 30 min of
training did not have memory at 24 h. Bottom, snails (N=12) that were
exposed to KCl and then yoke (i.e. non-contingently) trained showed no
significant difference in the number of attempted pneumostome openings from
naive levels, demonstrating that LTM was not formed. Reprinted from
Neurobiology of Learning and Memory 87, 391–403 (2007)
with permission from Elsevier (Martens et
al., 2007a).