(a) The four object animations presented during the input phase. Each subject was shown only one of the four animations. The objects moved smoothly, completing a full rotation every 6 seconds. (b) (Top) A schematic showing a 4-hour presentation schedule of the virtual object during the input phase. (Bottom) A schematic showing a 4-hour presentation schedule of the virtual objects during the test phase.
(a) The eight test contrasts presented during the test phase. The speciﬁc object animations depicted here were presented to the subjects who were imprinted to the ﬁrst animation shown in Figure 1a. (b) Subjects’ mean performance on the eight test contrasts. The dark gray bars denote the percentage of correct trials, and the light gray bars denote the proportion of time subjects spent with the familiar object on the Identity Trials and the familiar animation on the View-Speciﬁc Trials. Chance performance was 50%. Error bars denote standard error. (c) The representational dissimilarity matrix. Each cell of the matrix compares the behavioral response elicited by two test contrasts. Low dissimilarities (green colors) indicate that subjects exhibited similar behavior when presented with those test contrasts. High dissimilarities (red colors) indicate that subjects exhibited the opposite behavior when presented with those test contrasts. The dissimilarity between two test contrasts was measured as 1 minus the Pearson correlation between the set of performance values obtained across all subjects for the two different contrasts. The color scale reﬂects the full range of correlation values. (d) Change over time results. The graphs illustrate group mean performance for the Identity Trials and View-Speciﬁc Trials, computed for the ﬁrst, second, third, etc., presentation of the test contrasts. The y-axis indicates the proportion of time subjects spent with the familiar object on the Identity Trials and the familiar animation on the View-Speciﬁc Trials. Chance performance was 50%.
The abstraction space. Each dot depicts the object representation built by one subject. The y-axis reﬂects the representation’s sensitivity to identity information (measured from Contrasts A–D) and the x-axis reﬂects the representation’s sensitivity to view-speciﬁc information (measured from Contrasts E–H). The abstraction space shown on the left includes the representations built by all of the subjects, whereas the smaller abstraction spaces shown on the right include the representations built by the subjects who were imprinted to each of the two objects.