Object of psychology research attention are elusive concepts such as passion, perception, prejudice, and persuasion: we cannot directly observe any of these psychological concepts, we can make reasonable inferences about psychological concepts by making indirect observations. A few quick tips for using this text. Simile: a saying or description in which the communicator explicitly uses one concept to help people understand or appreciate another typically by using words such as like or as. Reading the barnum description: two reactions: Earliest explanations for human behaviour (and for the physical world as well) appear to have been metaphysical or supernatural explanations. Metaphysical systems: an early set of explanations for human behaviour and the operation of the physical world. Metaphysical explanations attributes behaviour or experience to the operation of nonphysical forces such as deities. Metaphysical explanations include (1) animism, (2) mythology and religion, and (3) astrology.