Figure 3

Recognition of a 3D object from a 2D picture is not affected by low-level visual properties. (a) During the sample session, mice viewed 2D pictures of a stimulus visually similar to the test session novel object. During the test session 24 h later, the mice explored the “familiar” object significantly less than the novel object. Inset, mice exhibited a significant discrimination of the novel object over the “familiar” object. (b) During the sample session, mice viewed 2D pictures of a stimulus visually dissimilar to the test session novel object in configuration only. During the test session 24 h later, the mice explored the “familiar” object significantly less than the novel object. Inset, mice exhibited a significant discrimination of the novel object over the “familiar” object. (c) To account for low-level luminance differences that may be guiding novel object preference, mice viewed 2D pictures of a chess piece (rook or bishop that were either black or white in color) during the sample session. During the test session 24 h later, mice exhibited a significant discrimination of the novel object over the “familiar” object regardless of the color in which the objects were presented. (d) During the sample session, mice viewed 2D pictures of a chess piece (rook or bishop that were either black or white). During the test session 24 h later, mice entered the familiar arena with the ‘familiar’ object in a novel color (i.e., if the mice received a picture of the white rook during sample, then during test, the rook was black) and the novel object in the same color as the sample 2D pictures. Regardless of the color in which the object was represented in the sample pictures, the mice preferentially explored the novel object and there was no difference in discrimination performance as a result of the color in which the stimuli were presented.