Goto, S., Terao, T., Hoaki, N., Wang, Y.: Cyclothymic and hyperthymic temperaments may predict bipolarity in major depressive disorder : a supportive evidence for bipolar II 1/2 and IV. J Affect Disord., 129 : 34-38, 2011.
Harada M., Hoaki N., Terao T., Hatano K., Kohno K., Araki Y., Mizokami Y., Kodama K., Toyokawa K., Izumi T., Arasaki M., Shimomura T., Fujiki M., Kochiyama T.: Hyperthymic temperament and brightness judgment in healthy subjects : Involvement of left inferior orbitofrontal cortex. J Affect Disord. 2013 Oct;151 (1):143-8. doi: 10.1016/j.jad. 2013.05.066. Epub 2013 Jun 15. PubMed PMID: 23778201.
Harada M., Terao T., Hatano K., Kohno K., Araki Y., Mizokami Y., Kodama K., Hoaki N., Arasaki M., Shimomura T., Fujiki M., Kochiyama T.: Hyperthymic temperament and brightness preference in healthy subjects : Further evidence for involvement of 2013 Jul 5. doi:pii: S0165-0327(13)00497-7.10.1016/j.jad.2013.06.017. [Epub ahead of print] Pub-Med PMID: 23835101.
Hoaki, N., Terao, T., Wang, Y., Goto, S., Tsuchiyama, K., Iwata, N.: Biological aspect of hyperthymic temperament: light, sleep, and serotonin. Psychopharmacology (Berl)., 213:633-638, 2011.