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Fig. 6. Too much stress and LTM formation. Snails that received a 30–35s KCl
bath before 30 min of tactile training, and then another 30–35s KCl bath
afterwards, did not have a significant decrease in pneumostome openings in a
MT 24 h later. When snails had the KCl bath and then training, but had the
second KCl bath replaced with exposure to pond water (PW) there was memory,
i.e. there was a significant decrease in attempted openings, 24 h later
(**P<0.01). [Reprinted from Martens et al.
(Martens et al., 2007a), with
permission from Elsevier.]