Two issues concerning the effects of visual pattern goodness on information processing time were investigated: the role of memory vs. encoding and the role of individual stimulus goodness vs. stimulus similarity. A sequential "same-different" task was used to provide differentiation of target item or memory effects from display item or encoding effects. Experiment 1 used four alternative stimuli in each block of trials. The results showed that good patterns were processed faster than poor patterns for both "same" and "different" responses. Furthermore, the goodness of the target item had a greater effect on reaction time than did the goodness of the display item, indicating that memory is more important than encoding in producing faster processing of good stimuli. Effects of interstimulus similarity on processing time were minimal, although isolation of good stimuli in a similarity space could explain many of the results. Experiment 2 replicated the results of Experiment 1, despite the fact that differences in similarity space had been minimized by using only two alternative stimuli in each block. In addition, the speed of processing a "same" pair was essentially independent of the particular alternative stimulus in a block. These results suggest that in this task, there is a processing advantage for good stimuli that is stimulus specific, with the effect operating primarily in memory.It is widely recognized that the structure of visual objects affects phenomenal experience, although the precise nature of that effect is not fully known. The Gestalt psychologists made substantial progress in understanding these experiences by enumerating characteristics of patterns that made them perceptually "good." More recently, Garner (1962) indicated how such goodness might be related to stimulus information and redundancy. He suggested that for a given pattern, the number of equivalent patterns provided a useful index of what constitutes a good figure: The fewer the number of equivalent patterns, the better the given pattern will be.For experimental purposes, rotations and reflections serve as one useful specification of equivalent patterns. If rotating and/or reflecting a pattern yields the same pattern, the number of equivalent patterns is one and the pattern is good; if rotating or reflecting a pattern yields several different patterns, the number of equivalent patterns is larger and the pattern is poorer. Garner and Clement (1963) showed that this definition was highly correlated with the way people rate goodness, thus providing a well-defined means of specifying a good or a poor pattern independent of subjective ratings.
Processing Consequences of GoodnessUsing a variety of information processing tasks, it has been found that good patterns are processed more efficiently than poor patterns, as measured by time or by errors. Since it has been shown that there exists a reliable processing advantage for good patterns, recent research has been primarily concerned with establishing the nature of that effect. In particular, t...