Screen size matches of familiar images are biased by canonical size, rather than showing a memory size effect.

Being confronted with the depiction of a familiar object activates a number of properties of the object that are stored in memory. Memory properties such as color and size have been shown to interfere with the processing of the color and of the size of the depiction, so that that reaction times are longer when the color or size of the depiction are incongruent with the stored knowledge about the object. In the case of color, it is known that the memorized information also affects the appearance of the depiction, for example when a gray banana appears slightly yellow, a phenomenon known as memory color effect. Here, I tested whether a memory size effect also occurs. To this aim, I conducted one experiment where observers matched either the screen size or the real-world size of pairs of animals or vehicles. The results indicate that the screen matches are biased in the same direction as the real-world size matches, opposite of what would be predicted by a memory color effect. This result was replicated in a second experiment using a different and larger set of animal images. Overall, I confirm that observers cannot ignore the real-world size information when they attempt to match the screen size of two items, although this results in a bias towards the canonical size of the items, rather than in a memory size effect.