In this study, we investigate whether color and brightness of object affect the memory of object pattern. In the experiment, the stimuli composed of four simple object patterns were presented 800 msec and after 10 sec delay, the observer was instructed to recall the object patterns by drawing them on the answer sheet. Four chromatic (red, yellow, green, or blue) and four achromatic (white, light gray, dark gray, or black) stimuli were used. In the chromatic stimuli, the object patterns and the background gray were matched in brightness for each color. In all the stimuli, perceived sharpness of edges of the object patterns were equalized experimentally. The present results were compared with those of the previous experiment in which perceived shrapness was not matched among stimuli. In the recall experiment, red and blue showed higher correct response than yellow and green in the chromatic stimuli consistent with the previous results indicating that not a sharpness of the edges but color difference between the object and background or saturation of the object is an important factor in pattern memory. In contrast to that, no significant difference was found in the achromatic stimuli in the present study whereas white showed higher score than grays and black in the previous result indicating that not a brightness contrast between the object and background but perceived sharpness of the edges of the object patterns contribute to pattern memory in achromatic stimuli.
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