MULTIDIMENSIONAL STIMULUS IDENTIFICATION - INSTRUCTING SUBJECTS IN THE ORDER OF REPORTING STIMULUS DIMENSIONS

Two experiments were conducted to investigate the effects of order of report on identification of multidimensional stimuli under various exp erimental conditions. Statistical analysis showed that order of report affected speed of identification. Subjects responded faster if a natu ral and more appropriate way of reporting stimulus dimensions was used . Further, subjects reacted more slowly if they were free to report st imulus dimensions in any order than when they were forced to report in a particular order. Their performance was even worse when order of re port was a within-subject factor. Response competition and response in hibition were proposed as possible explanations of the results. The im plications of the results for multidimensional identification tasks ar e to designate an appropriate order of reporting stimulus dimensions a nd to instruct subjects to respond in that order.