Final answer:
In the context of Freud's psychosexual stages, a fixation in the oral stage may lead to behaviors related to oral activities such as overeating, but it does not typically result in aggressiveness, which is the behavior not associated with this stage.
Step-by-step explanation:
A fixation in the oral stage of psychosexual development will include many behaviors related to the mouth and oral activities, as theorized by Sigmund Freud.
The oral stage occurs from birth to about 1 year of age, and is the time when infants gain pleasure primarily through oral activities like sucking and eating.
If an individual is fixated in the oral stage, they might engage in behaviors such as overeating, nail-biting, smoking, or excessive drinking, all of which serve to ease anxiety.
However, the one behavior that is not typically associated with a fixation in the oral stage is aggressiveness.
While low self-esteem, sarcasm, and self-consciousness can be psychological issues one might struggle with due to various complications in other stages or general psychological challenges, they are not specifically linked to the oral stage according to Freud's theory.