Final answer:
Karen Horney's theory includes her childhood experiences with basic anxiety which she believed influenced later personality development.
Step-by-step explanation:
Karen Horney incorporated her own childhood experience of basic anxiety into her theory. Horney's theories diverged from Freud's focus on psychosexual development, choosing instead to concentrate on the role of childhood experiences of loneliness and isolation contributing to what she termed basic anxiety. She proposed that this anxiety emerges from needs not being met, leading to coping strategies that influence personality development.