This cluster of papers explores the effects of stress on brain function, behavior, and cognition, with a focus on the role of cortisol, neurobiology, and the HPA axis. It covers topics such as the impact of stress on the immune system, neuroendocrine regulation, and the association between stress and disorders like depression. The research also delves into the neurobiology of resilience, hippocampal volume reduction, and the long-term consequences of prenatal stress.