Noting that there is good reason to believe the pineal gland is a magnetosensitive system and that application of magnetic fields in experimental animals has a similar effect to that of acute exposure to light with respect to melatonin secretion, the authors propose that magnetic treatment could be a beneficial new therapy for winter depression in humans.
R. Sandyk, et al., “Magnetic Felds and Seasonality of Affective Illness: Implications for Therapy,” International Journal of Neurosci, 58(3-4), June 1991, . 261-267.