Note 56 — Chapter V · THE NEUTRAL STATES.
Reading edition
Wundt, Grundzüge der physiol. Psychologie (4th German ed.), vol. i. pp. 557 et seq.; Lehmann, Hauptgesetze, etc., §§ 236-241. One of Wundt’s most distinguished pupils, Külpe, in his Umriss der Psychologie (1895), considers the existence of a state of indifference “can hardly be doubted in the face of a long series of observations which support it.” (English edition, p. 242.)