title: Unsymmetrical response features of left and right brain to signals from left and right visual fields at different cognitive levels.
abstract: OBJECTIVE
  To study the response characteristics of left and right brain to signals from left (LVF) and right (RVF) visual fields during cognitive activity.
  
  
  METHODS
  ERPs at 9 locations to LVF and RVF signals were compared in 23 normal subjects in 3 task conditions: looking forward only (VC); making switch response to target signals (T) only (SR); making switch response to T differentially (DR).
  
  
  RESULTS
  (1) Significant difference in ERPs was found between that induced by LVF and RVF signals on left brain especially at frontal location (F5), which appeared as slow negative deflection induced by T and NT from RVF in SR and DR; (2) Condition-dependent unsymmetrical features between left and right brain were found: the slow potential at F5 was significantly more negative in T and contralateral spatial relation (i. e., left brain for RVF) but more positive in NT and ipsilateral relation than that at F6.
  
  
  CONCLUSIONS
  Signals with psychological meaning in RVF might cause more psychological load as suggested by the results obtained in this study.
authors.affiliation: Institute of Space Medico-Engineering, Beijing.
authors.forename: J H
authors.initials: JH
authors.lastname: Wei
authors.forename: L
authors.initials: L
authors.lastname: Zhao
authors.forename: W
authors.initials: W
authors.lastname: Ren
authors.forename: D C
authors.initials: DC
authors.lastname: Li
authors.forename: G D
authors.initials: GD
authors.lastname: Yan
authors.forename: M H
authors.initials: MH
authors.lastname: Yang
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D003071:Cognition; D003626:Data Display; D004569:Electroencephalography; D004585:Electrooculography; D006804:Ergonomics; D005074:Evoked Potentials, Visual; D007839:Functional Laterality; D006801:Humans; D010775:Photic Stimulation; D011597:Psychomotor Performance; D014794:Visual Fields