Note 203 — Chapter IX

There is a possible interest in the exact length of the interval. Swoboda (Die Perioden des Menschlichen Organismus in ihrer psychologischen und biologischen Bedeutung, 1904) believes that the recurrence of memories tends to obey a law of periodicity, so that, for instance, a melody heard at a concert may recur at a regular interval. I cannot say that I have myself found evidence of such periodicity, though I have made several observations on the recurrence of such memories.