As Warren looks back over his long life, he feels a sense of unity in his life's accomplishments. He would be described as being in Erikson's stage of psychosocial development.

Ego-integrity vs. despair

Explanation:

As Warren looks back over his long life, he feels a sense of unity in his life's accomplishments. He would be described as being in Erikson's ego-integrity vs. despair stage of psychosocial development.

Ego-integrity vs. despair stage involves reflecting on one's life and either moving into feeling satisfied and happy with one's life or feeling a deep sense of regret. For example,as Warren looks back over his long life, he feels a sense of unity in his life's accomplishments.

ego-integrity vs. despair.

Explanation:

Erikson's psychosocial development involves eight stages. The eight stages are listed below:

(1). Infancy(Under 2 years): this stage of psychosocial development is known as the Trust vs. Mistrust stage.

(2). Toddlerhood(2–4 years): this stage of psychosocial development is known as the Autonomy vs. Shame/Doubt stage.

(3). Early childhood(5–8 years): this stage of psychosocial development is known as the Initiative vs. Guilt stage.

(4). Middle Childhood(9–12 years): this stage of psychosocial development is known as the Industry vs. Inferiority stage.

(5). Adolescence(13–19 years) : this stage of psychosocial development is known as the Identity vs. Role Confusion stage.

(6). Early adulthood(20–39 years) : this stage of psychosocial development is known as the Intimacy vs. Isolation stage.

(7). Middle Adulthood(40–59 years): this stage of psychosocial development is known as the Generativity vs. Stagnation stage.

(8). Late Adulthood(60 and above): this stage of psychosocial development is known as the Ego Integrity vs. Despair stage.

The last stage of the Erikson's psychosocial development is what we are dealing with in this question. It is the stage in which one reflect on his or her life just like Warren.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.