Final answer:
In Self-Determination Theory (SDT), autonomy is the psychological need described as the necessity to feel in control of one's own behavior and goals, providing a sense of volition and psychological freedom.
Step-by-step explanation:
The psychological need in the Self-Determination Theory (SDT) described as the basic need to feel in control of one's own behavior and goals is autonomy. Self-Determination Theory is a theory of motivation concerned with supporting our natural or intrinsic tendencies to behave in effective and healthy ways. The three psychological needs that are theorized to be innate and universal are autonomy, competence, and relatedness. Autonomy is the need to feel that we have control over our own lives, and that our actions are of our own volition. Competence is the need to feel capable and effective in one's activities and pursuits. Finally, relatedness is the need to have a sense of belonging and connectedness with others. Autonomy is a critical element because it supports the individual's capacity for self-regulation and the pursuit of core goals and interests, contributing to a sense of psychological freedom and volition.