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Unsymmetrical response features of left and right brain to signals from left and right visual fields at different
Objective:
To study the response characteristics of left and right brain to signals from left (LVF) and right (RVF) visual fields during cognitive activity.
Method:
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).
Result:
(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.
Conclusion:
Signals with psychological meaning in RVF might cause more psychological load as suggested by the results obtained in this study.