The experiment reported here was designed to investigate further the role of feedback in learning complex visual discrimination tasks such as screening mammography. Previous research has not yet established how feedback affects learning in such tasks and whether it is an important contributing factor in the acquisition of target detection skills at all. In this study, observers were required to search a computer-generated display of random background noise for a probabilistically defined target under one of four feedback conditions. The experiment was designed to compare each observer's baseline performance with performance when given feedback to overcome the problem of large individual differences typically observed in such tasks. It was found that feedback which is rich in target information is superior in improving accuracy of performance in this task when compared to feedback which does not give any information about target location and features or no feedback. Secondly, information-rich feedback seems to motivate observers to search the display for longer. The results are discussed in relation to designing training which specifically incorporates information-rich feedback.