Contemporary psychology refers to the modern and recent areas of psychological research and practice, such as biopsychology, evolutionary, developmental, personality, and social psychology. Each field studies different aspects of human behavior and mental processes through its unique lens. Biopsychology examines how biological processes, such as neurotransmitter activity, impact behavior. For instance, it studies how serotonin levels influence mood and social behavior. Evolutionary psychology views behaviors as survival strategies inherited from ancestors, such as the automatic avoidance of dangerous reptiles like snakes. Developmental psychology studies psychological and cognitive changes from infancy to old age and tracks how thinking, feeling, and behaviors evolve throughout a person's life. Personality psychology identifies stable traits and their impacts on behavior. For instance, it explores why certain individuals enjoy social gatherings while others prefer solitude. Social psychology investigates how the presence and behavior of others influence individuals, exploring group dynamics and interpersonal relationships.