High levels of stress can negatively effect memory processes in pond snails, according to research by Canadian and British scientists. "In our research we've found that snails respond to stress in a similar way to mammals (including humans), in that it interferes with memory formation," said Exeter University's Sarah Dalesman, lead author of the study. Researchers found that a single stressful event caused impaired memory in the snails, but that many stressful events actually stopped any memories from forming.

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