The repeated exposure of unmasked irregular geometric shapes for very brief durations (1 or 2 ms) has been shown to generate preferences as well as judgments of familiarity for the previously exposed shapes. At the same time these stimuli are not recognized as having been presented. Such exposure also leads to judgments of brightness and darkness independent of stimulus intensity, and it is dependent on the use of unmasked stimuli. This effect is nonspecific, in contrast to stimulus-specific effects with masked stimuli, and it is not restricted to affective judgments.