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The biological basis of personality is a collection of brain systems and mechanisms that underlie human personality. Human neurobiology, especially as it relates to complex traits and behaviors, is not well understood, but research into the neuroanatomical and functional underpinnings of personality are an active field of research.
People can be tested based on their activation of either systems by using an EEG. These tests will conclude whether a person has a more active BIS or BAS. The two systems are independent of each other. [15] These tests can determine different things about a person's personality. They can determine if a person has more positive or negative moods ...
Even psychologists are still studying and researching to fully understand what personality means and why personality changes. The development of personality is often dependent on the stage of life a person is in. [6] Most development occurs in the earlier stages of life and becomes more stable as one grows into adulthood. [6]
Personality development is also dimensional in description and subjective in nature. [2] That is, personality development can be seen as a continuum varying in degrees of intensity and change. It is subjective in nature because its conceptualization is rooted in social norms of expected behavior, self-expression, and personal growth.
Currently, there are two major theories of the brain's cognitive function. The first is the theory of modularity. Stemming from phrenology, this theory supports functional specialization, suggesting the brain has different modules that are domain specific in function.
Extraversion and introversion are a central trait dimension in human personality theory. The terms were introduced into psychology by Carl Jung, [1] though both the popular understanding and current psychological usage are not the same as Jung's original concept.
The book How the Way We Talk Can Change the Way We Work presents a practical method called the "immunity map" to help people overcome an immunity to change, an obstacle to further psychological development. [43] The map is made of a four-column worksheet that guides a process of self-reflective inquiry.
That is why personality tests can predict how people will behave. That means also that tests can be used to identify important human behaviors, and the learning that produces those behaviors can be studied. Gaining that knowledge will make it possible to develop environmental experiences that produce or prevent types of personality from developing.