事件关联脑电位(ERP)与手控工作负荷关系的研究

Relationship Between ERP and Workload in Manual Control

本实验对7名被试者从事三种难度手控条件下,以不同的关联事件所引起的ERP 进行了分析讨论.结果表明,随手控难度增加,低调声音信号所引起的P300幅度相应降低;而由与主作业成分有关的视觉信号所引起的P300的幅度则随手控难度的增加而增加。这二类P300幅度变化,可能因主副作业对信息加工资源利用的竞争与协同所致.P300对操作者的感知/认知负荷具有选择敏感性,可以用于手控工作负荷的评定.

The P300 amplitude elicited by different kinds of relevant eventawere analysed in 7 subjects during manual control with three levelsof tracking difficulty.The results indicated that the P300 amplitudeaelicited by the auditory siginall of the secondary task reduced as afunction of tracking difficulty,in contrast,those elicited by the vis-ual relevant signal embedded in the orimary task increased with inc-rease in tracking difficulty.This difference in changes of P300 amp-litudes appdared to be resulted from the competition or synergism inthe resources bftween the primary and secondary tasks P300 was se-lectively sensitive to the perceptual/cognitive demands imposed onthe operators and could be employed as an index for workload assess-ment of manual control.in the utilization of common information processing resources betweenthe primary and secondary tasks.P300 can be employed as an indexfor workload assessment of manual(?) control due to its selective sen-sitivity to the perceptual/cognitive demands imposed on the operators.