title: Life events, frontal electroencephalogram laterality, and functional immune status after acute psychological stressors in adolescents.
abstract: OBJECTIVE
  Past studies have found that environmental stress affects cellular immune function and that extensive variability exists in the magnitude and direction of stress-induced immune changes. Past research also suggests that individuals with greater right, relative to left, resting frontal electroencephalogram (EEG) activation perceive environmental stress as more aversive and have lower baseline cellular immune function. In this study, we examined environmental stressors, resting frontal EEG laterality, and immune responses to short-term psychological stressors in adolescent boys.
  
  
  METHODS
  A sample of twenty-four 14-16 year old right-handed boys underwent a recording of resting EEG and collections of blood taken before and after a laboratory protocol designed to induce psychological stress. Blood samples were used to measure changes in mitogen lymphoproliferative responses, natural killer (NK) cell activity, and T-cell phenotypic subsets. Life events were measured using self-report questionnaires.
  
  
  RESULTS
  Life events and frontal laterality showed a first order interaction in predicting changes in lymphocyte proliferation to tetanus toxoid (R2 increment = .26, p < .01) and pokeweed mitogen (R2 increment = .25, p < .02). The interaction also predicted changes in NK activity (R2 increment = .24, p < .02).
  
  
  CONCLUSIONS
  Changes in lymphocyte proliferation and NK activity were associated with negative life events only among individuals with greater left frontal cortical activation. Our results suggest that recent psychosocial stress and individual differences in resting frontal cortical activation are together linked to immunologic responses to acute psychological stressors.
authors.affiliation: Asian Health Services, Oakland, California 94607, USA.
authors.forename: S W
authors.initials: SW
authors.lastname: Liang
authors.forename: J M
authors.initials: JM
authors.lastname: Jemerin
authors.forename: J M
authors.initials: JM
authors.lastname: Tschann
authors.forename: D W
authors.initials: DW
authors.lastname: Wara
authors.forename: W T
authors.initials: WT
authors.lastname: Boyce
mesh_terms: D000293:Adolescent; D000917:Antibody Formation / Q000276:immunology*; D001143:Arousal / Q000502:physiology*; D001288:Attention / Q000502:physiology; D001402:B-Lymphocytes / Q000276:immunology; D004292:Dominance, Cerebral / Q000502:physiology*; D004569:Electroencephalography; D005625:Frontal Lobe / Q000503:physiopathology*; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology; D008016:Life Change Events; D008213:Lymphocyte Activation / Q000276:immunology*; D018655:Lymphocyte Count; D008297:Male; D010555:Personality Inventory; D011597:Psychomotor Performance / Q000502:physiology; D012919:Social Behavior; D016176:T-Lymphocyte Subsets / Q000276:immunology