Studies have shown that rats exposed to more complex environments develop heavier brains than rats NOT exposed to those environments.

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This is true. Numerous studies have shown that rats and other animals exposed to more complex environments (i.e. with more toys, obstacles, and social interaction) have higher brain weights and more developed neural connections compared to animals raised in simpler environments. This phenomenon is known as environmental enrichment, and it suggests that mental stimulation and engagement can have a positive impact on brain development and function.

Studies Have Shown That Rats Exposed to More Complex Environments