Introduction Excursus: A brief overview of the history of police psychology in Germany. The psychological perspective or what questions does psychology pose? Lay psychology and scientific psychology. An overview of the theoretical perspectives of psychology: the biological perspective, the psychodynamic perspective/psychoanalysis, the behavioral perspective/behaviorism or learning theory perspective, the humanistic perspective/humanistic psychology, the cognitive perspective/cognitivism, the systemic perspective. Selected biological foundations: genetic foundations, intelligence development, the nervous system, the human brain. The psychology of perception: sensory deprivation, physical stimuli and sensations, processes of perceptual organization.