Figure 9.

Shape-based object knowledge is insufficient for material recognition. Accuracy at identifying the object in each image as dessert, fruit, or flower (left panel) and as a real or fake example of that object (right panel) is shown here as a function of stimulus duration. Observers were able to identify the object category accurately in all three exposure conditions. Their performance at identifying real versus fake was lower, and it improved with longer exposures. The pattern of these results tells us that shape-based object identity is insufficient for the real versus fake material discrimination and that observers can make fine material discriminations even in brief presentations. Error bars represent 1 SEM across seven observers. Chance performance (black lines) is 0.33 for the object task and 0.5 for the real versus fake task.