Koelega H S, Brinkman J A, Hendriks L, Verbaten M N
Hum Factors. 1989 Feb;31(1):45-62. doi: 10.1177/001872088903100104.
In an attempt to specify the limiting conditions of the taxonomy of vigilance tasks, four tasks differing in memory load and in stimuli employed (sensory or cognitive) were compared. Electrodermal activity and subjective measures were used to determine the investment of effort. The data show that vigilance level and vigilance decrement dissociate. The level seems to relate to effort demand and investment; the decrement seems to be task driven, determined mainly by the type of stimuli used. Tasks employing unfamiliar stimuli showed a decline in sensitivity; "cognitive" tasks employing alphanumeric stimuli did not. Principal components analyses suggest that measures of speed and accuracy may reflect relatively independent systems. Subjective data showed that good performers expand more effort in difficult and complex tasks. Effortful processing seems to prevent rather than induce a decline in efficiency.
为了明确警戒任务分类的限制条件，对四项在记忆负荷和所采用刺激（感官或认知）方面存在差异的任务进行了比较。采用皮肤电活动和主观测量方法来确定努力程度。数据表明，警戒水平和警戒衰退相互分离。警戒水平似乎与努力需求和投入有关；警戒衰退似乎由任务驱动，主要由所使用刺激的类型决定。采用不熟悉刺激的任务表现出敏感性下降；采用字母数字刺激的“认知”任务则没有。主成分分析表明，速度和准确性的测量可能反映相对独立的系统。主观数据显示，表现出色的人在困难和复杂任务中投入更多努力。费力的加工似乎能防止而非导致效率下降。
