In a series of studies by Meaney and colleagues,rat pups were randomly assigned to be raised by surrogate mothers who spent a lot of time licking and grooming (high LG)them or surrogate mothers who spent little time engaging in this behaviour (low LG).Rat pups raised by high-LG surrogates grow up to be _____ fearful in novel situations,which can be attributed to a(n)_____ in DNA methylation.

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Rat pups raised by high-LG surrogates grow up to be less fearful in novel situations, which can be attributed to a decrease in DNA methylation.

In a Series of Studies by Meaney and Colleagues,rat Pups