人在多项任务中的业绩及脑力负荷

在超脑力负荷状态下人的业绩是如何变化的？在实验中，让被试者同时完成四项内容不同的任务，即补偿追踪，选择反应，模拟雷达观察和算术运算。脑力负荷的强度是由改变工作的快慢节奏来实现的。实验的数据表明，随着脑力负荷的增加，人的业绩是逐渐下降的。在面对超负荷的多项任务时，人的信息处理过程更像一个单通道系统，集中精力完成某一工作，然后迅速地转移到下一个工作。

HUMAN PERFORMANCE AND MENTAL WORKLOAD UNDER MULTIPLE TASK DEMANDING CONDITIONS

The purpose of this study was to find out how human performance and mental workload changes when people face multiple task demands. In an experiment,the subjects were asked to do four information processing tasks simultaneously.The four tasks were tracking,choice reaction time, monitoring and mental arithmetic.The task demands were changed by increasing the speed of task presentation on computers.The experimental results showed that with the increase of task demands,the subjects'performance deteriorated, but the deterioration was task specific.When facing multiple tasks simultaneously,the human subjects seemed to be like a single channel mechanism,concentrating on one task and then switching their attention to another task.The reasons and the implications were discussed.