The psychodynamic explanation of schizophrenia proposes that: 1) Unresolved conflicts between the id, ego, and superego are repressed into the unconscious, causing regression to an early developmental stage. 2) This regression leads to inner turmoil and a breakdown in reality testing, resulting in schizophrenic behaviors. 3) Methodological criticisms of this explanation include that Freud's research lacked modern standards and used a non-representative sample, limiting the validity and generalizability of his findings.