Lifestyle may also vary, noting still, it's relevance with culture. Culture involves spirituality, traditions, customs, attitudes, beliefs, and behaviours, serve as filters through which the person may respond to its surroundings. Another of the potential sources of error and bias in the development and application of intelligence tests is the ongoing debate of whichever is more influential, heredity or environment - nature vs. nurture. In this aspect, the validity of the test is also affected, thus affecting its development and application. With such controversies continuing, the tests are still in use, but not anymore the sole determiner of the child's mental and emotional abilities and conditions ("Intelligence Tests").
Theories of personality have a widespread interest among most schools of psychology and had contributed many ideas in this field of psychology. Freud's theory on personality centres more on the human sexuality, whereas psychologists such as Jung and Horney may beg to differ. However, when it comes to contemporary theories of personality, it is usually connected to intelligence. The cognitive aspect of personality is popularized by Carl Jung. In this theory, it states that by changing our thoughts, it follows that we change our moods, our anxiety, and the state of our relationships. ...