ABSTRACT
Psychology: natural and/or social science Conceiving psychology as natural science, we deal with human biological faculties. We search for universal laws between the physical or social environment and forms of human adaptation that enlighten human nature. Environmental variation and individual differences reflect conditions that govern particular occurrences of universal laws. We search for causal relations between changes in the external or internal environment and human behaviour, transform these changes into experimental variables, form hypotheses, and test these hypotheses in experiments.
