Mewhort D J, Huntley M F, Duff-Fraser H
Department of Psychology, Queen's University, Kingston, Ontario, Canada.
Percept Psychophys. 1993 Dec;54(6):759-62. doi: 10.3758/bf03211800.
In two experiments, we tested subjects' ability to localize a letter in a character string with identification controlled by varying the delay of a mask, dimming the display, or deleting some of the dots used to define the letters on the cathode-ray screen. The first experiment involved two tasks. In the first task, subjects indicated whether or not a letter named verbally had been present in an eight-letter target string. In the second task, they localized a letter named verbally in the target string; the target string was presented by using display parameters shown in the first task to hold character identification between 70% and 75% correct. In the second experiment, we tallied errors in a partial-report bar-probe study after equating performance across the manipulations of display quality. Masking disrupted subjects' ability to recover location information more than either a manipulation of stimulus luminance or a manipulation of its visual form.
在两项实验中，我们通过改变掩蔽延迟、使显示屏变暗或删除阴极射线屏幕上用于定义字母的一些点来控制识别，以此测试受试者在字符串中定位字母的能力。第一个实验包含两项任务。在第一项任务中，受试者要指出一个口头说出的字母是否出现在一个由八个字母组成的目标字符串中。在第二项任务中，他们要在目标字符串中定位一个口头说出的字母；呈现目标字符串时使用的显示参数与第一项任务相同，以使字符识别正确率保持在70%至75%之间。在第二个实验中，我们在使显示质量的各项操作的表现达到均衡后，统计了部分报告条形探测研究中的错误。与刺激亮度或视觉形式的操作相比，掩蔽对受试者恢复位置信息能力的干扰更大。
