Abstract: Four groups of matric histoform, namely, the random metric figures,the restricted motric figures, the large dispersion metric figures, the smalldispersion metric figures were used as target figures in this study. Each groupconsisted of 6 metric figures. Each figure was presented by two kinds ofexposed time (1/2 sec. 4/5 sec.) and was put on three distances (40M. 80M.120M.). The subject was required to recognize the target figure from the 6comparable figures as soon as possible. The results showed that the subject's recognition performance of therandom figures was better than that of the restricted figures. Similarly,recognition performance of the small dispersion figures was better than thatof the large dispersion figures. The effect of exposed time on recognition wasmore pronounced. It may be argued that the relational parameter which comesfrom the sampling rule and dispersion may be used as a predictor ofperformance in some perceptual tasks.

Key words: NULL