Theoretical Postulations-Freud

I’m studying and need help with a Psychology question to help me learn.

Freud started his theoretical postulations by studying patients with  hysterical or conversion reactions. This led to his realization that his  patients had conscious and unconscious aspects of memory. Why was this  realization significant? How did this influence the development of the  field of psychology? Explain.

Read:

Sletvold, J. (2016). Freud’s three theories of neurosis: Towards a contemporary

theory of trauma and defense. Psychoanalytic Dialogues, 26(4), 460-475.