知觉反馈不能提高安检视觉搜索绩效

医学放射影像诊断的研究发现知觉反馈能有效地提高搜索绩效。通过实验检验该方法在行李安检任务的有效性,两组安检员随机分配到反馈组和无反馈组,反馈组第二次搜索的图片是将第一次搜索时注视时间大于1000ms的区域突出显示出来;无反馈组第二次搜索的图片就是原图片。结果表明,两组被试第二次的搜索绩效和第一次之间没有差异,知觉反馈的方法不能提高安检视觉搜索绩效。第二次搜索的反应时比第一次短;眼动数据表明第二次搜索时对兴趣区域的注视时间比第一次短。眼动信息知觉反馈没有提高安检员的搜索终止阈值,没有起到吸引安检员仔细观察识别的作用。眼动信息的传递方式是值得进一步研究的问题。

Perceptual feedback is an effective tool to improve visual search performance in diagnostic radiology f ield. An experiment was conducted to explore the application of this method in security screening task. The image with circles which had been f ixated for more than the threshold f ixation time of 1000ms in the f irst presentation was represented to observers of feedback group for second view. Observers in the no-feedback group simply had a second view at the stimuli. The result showed that the performance of second view was not better than that of the f irst view, which indicated that perceptual feedback did not yield reliable performance benef its. The reaction time of second view was shorter than that of the f irst view. T he eye movements showed that the dwell time on the AOI for the f irst view was longer than that of the second view. The perceptual feedback with eye movement information did not increase quitting thresholds and screeners did not perform a more thorough search. How to convey eye movement information to the user is a challenge problem.