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Persistent and unwanted thoughts can cause anxiety.

A group of people referred to by an individual to evaluate their behavior, norms and values.

excessive self-love, and strong attachment to oneself, And a desire to enlarge one’s own “ego”.

The ability of the nervous system to change its structure and functions in response to experience and learning.

A range of values is a typical property of a group or individual on the basis of which comparisons can be made.