title: Hyperthymic temperament and rapid reaction time in brightness preference.
abstract: BACKGROUND
  It is well-known that Type A behavior pattern is characterized by hard-driving, competitive behavior and time urgency. Also, people with hyperthymic temperament are known to have high energy levels and are full of plans. It is therefore hypothesized that hyperthymic temperament is associated with rapid processing and fast reaction time in making decisions.
  
  
  METHODS
  Using data from our previous experimental studies (N=58) examining brightness judgment and brightness preference, reaction time (RT) was investigated in relation to hyperthymic temperament scores and fMRI signal changes of the left inferior orbitofrontal cortex during brightness judgment.
  
  
  RESULTS
  RT for brightness judgment was significantly shorter than RT for brightness preference. Significant associations were found between RT for brightness preference and hyperthymic temperament scores, and RT for brightness preference and fMRI signal changes of the left inferior orbitofrontal cortex whilst performing brightness preference task. Multiple regression analysis revealed that RT for brightness preference task was significantly and negatively associated with hyperthymic temperament scores, and significantly and positively associated with fMRI signal changes of the left inferior orbitofrontal cortex.
  
  
  CONCLUSIONS
  It is uncertain whether the findings of RT (around 1s) can be extrapolated to routine life (around 24h) and whether RT for brightness preference can be generalized to a variety of daily activities.
  
  
  CONCLUSIONS
  The present findings suggest that hyperthymic temperament is associated with rapid processing. Further studies are required to overcome the above limitations.
authors.affiliation: Department of Neuropsychiatry, Oita University Faculty of Medicine, Oita 879-5593, Japan.
authors.forename: Kensuke
authors.initials: K
authors.lastname: Kodama
authors.forename: Mayu
authors.initials: M
authors.lastname: Harada
authors.forename: Takeshi
authors.initials: T
authors.lastname: Terao
authors.forename: Koji
authors.initials: K
authors.lastname: Hatano
authors.forename: Kentaro
authors.initials: K
authors.lastname: Kohno
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Araki
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Mizokami
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Hoaki
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Shimomura
authors.forename: Minoru
authors.initials: M
authors.lastname: Fujiki
authors.forename: Takanori
authors.initials: T
authors.lastname: Kochiyama
mesh_terms: D000328:Adult; D005260:Female; D005625:Frontal Lobe / Q000502:physiology; D059907:Functional Neuroimaging; D006801:Humans; D007600:Judgment; D008027:Light; D008279:Magnetic Resonance Imaging; D008297:Male; D010555:Personality Inventory; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology*; D013694:Temperament / Q000502:physiology; D014796:Visual Perception / Q000502:physiology; D055815:Young Adult
keywords: Bipolar disorder; Brightness preference; Hyperthymic temperament; Reaction time; fMRI