In mice, epigenetic marks made on histones during infancy influence depression-like behavior during adulthood. A drug that reverses the genomic tags appears to undo the damage.
Our perception of quantity, separate from counting or estimation of magnitude more generally, is foundational to human cognition, according to some neuroscientists.
Adolescent rats exposed to stress grow into pathologically aggressive adults, behaviors that may be explained by accompanying epigenetic changes and altered brain activity.