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Fig. 5. Snail learning `grade distributions'. Snails were given grades based on
their individual performance. Grades were calculated as follows: a 50%
reduction or greater is an A, a B is a reduction of 35–49.99%, a C is a
20–34.99% reduction, and an F is a reduction of less than 20%. (A) Grade
distributions observed to occur under standard hypoxic conditions
(N=2301). (B) Distribution of grades for snails presented with the
`more intense hypoxic challenge' (N=23). These snails showed a
statistically greater number of A grades and fewer F grades than controls
(P=0.0007). (C) Grade distributions seen for snails trained in the
hypoxia + 50 µmol l–1 H2S condition
(N=24). (D) Distributions for snails trained in the hypoxia + 75
µmol l–1 H2S (N=11). (E) Distributions
for training in hypoxia + 100 µmol l–1 H2S
condition (N=23).
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