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. 2021 Jun 25;6:45. doi: 10.1186/s41235-021-00304-2

Fig. 3.

Fig. 3

An example of an item that has already been checked off of the participant’s list (top), an item that the participant is currently viewing by pointing to it with the mouse (center), and an item that is masked and not yet checked off of the participant’s list (bottom)