Which hormone has been linked to aggression and status-seeking behavior in rats?

• A. Testosterone
• B. Estrogen
• C. Cortisol
• D. Adrenaline

Answer: (A)

Hormones influence aggression and dominance in animals, with testosterone playing a central role in rats. In male rats, higher testosterone is tied to more frequent aggressive encounters and displays of dominance during territory defense or mate competition. Castration reduces aggression and status-seeking behaviors, while testosterone replacement restores them, showing a causal link between this hormone and those social behaviors. Brain regions such as the amygdala and hypothalamus respond to testosterone, helping translate hormonal signals into aggressive or dominant actions within a social context. Other hormones like estrogen, cortisol, and adrenaline can affect behavior, but testosterone is the most directly linked to aggression and status-seeking in rats.