According to Sibelius biographer Erik W. Tawaststjerna, the Symphony reflects the psychoanalytical and introspective era when Sigmund Freud and Henri Bergson stressed the meaning of the unconscious, and he calls the Fourth Symphony "one of the most remarkable documents of the psychoanalytical era."
De acordo do biógrafo Erik W. Tawaststjerna, a sinfonía reflicte a era psicanalítica e introspectiva cando Sigmund Freud e Henri Bergson salientaban o sentido do inconsciente, e chama á Cuarta Sinfonía "un dos máis remarcables documentos da era psicanalítica".