Hyperthymic temperament and brightness judgment in healthy subjects: Involvement of left inferior orbitofrontal cortex

• Published in: Journal of affective disorders Vol. 151; no. 1; pp. 143 - 148
• Main Authors: Harada, Mayu, Hoaki, Nobuhiko, Terao, Takeshi, Hatano, Koji, Kohno, Kentaro, Araki, Yasuo, Mizokami, Yoshinori, Kodama, Kensuke, Toyokawa, Koji, Izumi, Toshihiko, Arasaki, Miyano, Shimomura, Tsuyoshi, Fujiki, Minoru, Kochiyama, Takanori
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier B.V 01.10.2013; Elsevier
• Subjects: Adult; Adult and adolescent clinical studies; Affect - physiology; Affective disorders; Biological and medical sciences; Bipolar Disorder - physiopathology; Brain - physiology; Brightness; Darkness; Female; fMRI; Frontal Lobe; Functional Neuroimaging; Healthy subjects; Humans; Hyperthymic temperament; Judgment - physiology; Light; Magnetic Resonance Imaging; Male; Medical sciences; Mood disorders; Photic Stimulation; Psychiatry; Psychology. Psychoanalysis. Psychiatry; Psychopathology. Psychiatry; Sensory Thresholds; Temperament; Visual Perception; Young Adult; fMRI; Healthy subjects; Hyperthymic temperament; Brightness; Human; Orbitofrontal cortex; Healthy subject; Central nervous system; Personality; Nuclear magnetic resonance imaging; Temperament; Encephalon; Vision; Stimulus brightness; Functional magnetic resonance imaging; Medical imagery; Perception; Functional imaging; Judgment
• ISSN: 0165-0327; 1573-2517; 1573-2517
• DOI: 10.1016/j.jad.2013.05.066

Hyperthymic temperament has been generally accepted as one of premorbid temperament of bipolar disorders. Since recent several studies indicate an association between illuminance and hyperthymic temperament, it can be hypothesized that more hyperthymic temperament subjects have a different threshold of brightness or darkness perception in comparison with less hyperthymic temperament subjects. We compared the threshold of brightness and darkness judgment between more and less hyperthymic subjects, and by simultaneously using fMRI we compared activations of whole brain between these subjects by two sample t-test. Furthermore, the association between the activations and hyperthymic temperament scores was analyzed. Although there was no significant difference in the threshold of brightness or darkness judgment between more and less hyperthymic subjects, there was a significant difference in activations of the regions including left superior temporal gyrus, left inferior orbitofrontal cortex, left triangular inferior frontal gyrus and left insula between these subjects. Moreover, there was a significantly positive association between a cluster containing left inferior orbitofrontal cortex and hyperthymic temperament scores. The common activated region of these two analyses (categorical and continuous ones) was determined as left inferior orbitofrontal cortex. Limitation of the present study is a lack of brightness and darkness preference experiment between more and less hyperthymic subjects. The present findings suggest that the threshold of brightness and darkness judgment is not different between more and less hyperthymic subjects, and that hyperthymic temperament may be associated with left inferior orbitofrontal cortex, which has been reported to be associated with bipolar disorder.