There are a number of views on the nature of psychology. However, the main opinion is that psychology is a multi–disciplinary subject with a scientific orientation, that uses a number of different approaches. These different approaches complement one another. Thus, in the study of memory, the experimental approach enables psychologists to measure in the laboratory the effect of variables on, for example, the ability to recall under different conditions. Although this may be an artificial setting, such findings can be applied to everyday life, in the form of using mnemonic techniques. Cognitive psychologists try to imagine how different memory systems might work together, suggesting that we have for example, two different memory stores — one for short-term and one for long-term remembering. Physiological psychologists also investigate memory by trying to find which parts of the brain are involved with the storage of memories There is a link between research into memory and the psychoanalytic approach. One of the theories of why we forget includes motivated forgetting, which suggests that certain emotionally charged memories (such as abuse as a child) may be forgotten on purpose (i.e. repressed).