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首页> 外文期刊>Journal of Experimental Psychology. General >Low target prevalence is a stubborn source of errors in visual search tasks
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Low target prevalence is a stubborn source of errors in visual search tasks

机译：目标普及率低是视觉搜索任务中错误的顽固根源

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摘要

In visual search tasks, observers look for targets in displays containing distractors. Likelihood that targets will be missed varies with target prevalence, the frequency with which targets are presented across trials. Miss error rates are much higher at low target prevalence (1%-2%) than at high prevalence (50%). Unfortunately, low prevalence is characteristic of important search tasks such as airport security and medical screening where miss errors are dangerous. A series of experiments show this prevalence effect is very robust. In signal detection terms, the prevalence effect can be explained as a criterion shift and not a change in sensitivity. Several efforts to induce observers to adopt a better criterion fail. However, a regime of brief retraining periods with high prevalence and full feedback allows observers to hold a good criterion during periods of low prevalence with no feedback.
机译：在视觉搜索任务中，观察者会在包含干扰物的显示器中寻找目标。靶标遗漏的可能性随靶标发生率，试验中出现靶标的频率而异。低目标流行率（1％-2％）下的未命中错误率要比高流行率（50％）高。不幸的是，低流行率是重要搜索任务的特征，例如机场安全和医疗检查，其中错失错误是危险的。一系列实验表明，这种流行效果非常可靠。用信号检测术语来说，患病率可以解释为标准偏差而不是灵敏度变化。促使观察者采用更好的标准的几种努力都失败了。但是，具有高患病率和全面反馈的短暂再培训期间的制度使观察员在患病率低的时期中没有反馈就可以保持良好的标准。

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