Which of the following statements is true about the brain's ability to grow new neurons?

The assertion that the brain can grow 700 new neurons a day aligns with current understanding of neurogenesis, particularly in areas such as the hippocampus, which is associated with memory and learning. This process is influenced by various factors including age, physical exercise, stress, and environmental enrichment. Research has shown that while neurogenesis decreases with age, the adult brain does retain the capacity to generate new neurons.

In contrast, the notion that the brain can grow 1,000 new neurons a day is an exaggeration, as studies support the figure of around 700 per day under optimal conditions. The idea that the brain cannot regenerate any neurons is outdated; it has been established that neurogenesis occurs in specific brain regions throughout life, debunking the myth of complete neuronal immutability. Moreover, positing that the brain can only regenerate in infants overlooks the substantial evidence that adults also experience neurogenesis.

Thus, the correct statement captures the ongoing potential for neuronic development in the adult brain, highlighting an important aspect of brain plasticity.