The term self-schema refers to the beliefs and ideas people have about themselves. These beliefs are used to guide and organize information processing, especially when the information is significant to the self. Self-schemas are important to a person's overall self-concept.
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The term schematic describes having a particular schema for a particular dimension. For instance, a person in a rock band at night would have a "rocker" schema. However, during the day, if he works as a salesperson, he would have a "salesperson" schema during that period of time. Schemas vary according to cultural background and other environmental factors.
Once people have developed a schema about themselves, there is a strong tendency for that schema to be maintained by a bias in what they attend to, in what they remember, and in what they are prepared to accept as true about themselves. In other words, the self-schema becomes self-perpetuating. The self-schema is then stored in long-term memory, and both facilitates and biases the processing of personally relevant information.
The term aschematic means not having a schema for a particular dimension. This usually occurs when people are not involved with or concerned about a certain attribute. For example, if a person plans on being a musician, a self-schema in aeronautics will not attribute to him; he is aschematic on aeronautics.
Self-schemas vary from person to person because each individual has very different social and cultural life experiences. A few examples of self-schemas are: exciting or dull; quiet or loud; healthy or sickly; athletic or nonathletic; lazy or active; and geek or jock. If a person has a schema for "geek or jock," for example, he might think of himself as a bit of a computer geek and would possess a lot of information about that trait. Because of this, he would probably interpret many situations based on relevance to his being a computer geek.
Another person with the "healthy or sickly" schema might consider herself a very health conscious person. His concern with being healthy would then affect everyday decisions such as what groceries he buys, what restaurants he frequents, or how often he exercises. Women who are schematic on appearance exhibited lower body image, lower self-esteem, and more negative mood than did those who are aschematic on appearance.
Most people have multiple self-schemas, however this is not the same as multiple personalities in the pathological sense. Indeed, for the most part, multiple self-schemas are extremely useful to people in daily life. Subconsciously, they help people make rapid decisions and behave efficiently and appropriately in different situations and with different people. Multiple self-schemas guide what people attend to and how people interpret and use incoming information. They also activate specific cognitive, verbal, and behavioral action sequences – called scripts and action plans in cognitive psychology – that help people meet goals efficiently.