Giesbrecht B, Dixon P
Department of Psychology, University of Alberta, Edmonton, Canada.
Mem Cognit. 1999 Mar;27(2):220-33. doi: 10.3758/bf03211407.
In bar-probe partial report experiments, subjects are presented with a brief array of letters, followed by a cue that singles out a target letter. Using this procedure, V. M. Townsend (1973) reported a counterintuitive effect: As the duration of a cue was increased, target performance decreased dramatically. The aim of the present study was to isolate the locus of the cue-duration effect. To this end, several characteristics of the bar-probe display were manipulated in a single experiment: the interstimulus interval between the array and the cue, array density, the number of letters, and the number of symbols adjacent to the target. These factors were manipulated on a priori grounds so as to affect the different sources of information used in the bar-probe task--namely, durable storage, abstract identity information, and feature level information. The data were accurately fit by a simple quantitative, multinomial model that assumes that the different sources of information used in the bar-probe task make independent contributions to performance. The critical assumption of the model is that cue duration interferes with only one source of information--namely, feature level information.
在条形探针部分报告实验中，向受试者呈现一组简短的字母，随后给出一个提示，指出目标字母。运用此程序，V.M.汤森德（1973年）报告了一个与直觉相悖的效应：随着提示持续时间的增加，目标表现急剧下降。本研究的目的是确定提示持续时间效应的发生位点。为此，在一项单一实验中对条形探针显示的几个特征进行了操控：数组与提示之间的刺激间隔、数组密度、字母数量以及与目标相邻的符号数量。基于先验理由对这些因素进行操控，以便影响条形探针任务中所使用的不同信息源，即持久存储、抽象身份信息和特征水平信息。数据通过一个简单的定量多项模型得到了精确拟合，该模型假设条形探针任务中使用的不同信息源对表现做出独立贡献。该模型的关键假设是提示持续时间仅干扰一种信息源，即特征水平信息。
