Figure 3: Overview of human behavioral experiments in a class incremental setting.

(a) Two example object instances from each of two families in the Novel Object Dataset (NOD, Sec 3.4). (b) Experiment schematic. Subjects progressed through 4 tasks, each with a training and testing round. During training, subjects were presented with three rotating object instances per family for 30 seconds, with the goal of being able to recognize the objects presented in the testing round. In the first training round, 2 families were introduced. In subsequent training rounds, one additional family was introduced per task, without showing instances from previously learned families. During testing, subjects were tested on 10 trials from each learned family. The trial order was randomly shuffled during testing. (c) In each test trial, subjects were presented with a fixation cross (2000ms) followed by the stimulus (200ms). After the image offset, subjects were asked to choose the family of the presented object among all previously encountered families.