Fig. 4: An example of the experimental procedure of the delayed match-to-sample task.
From: Mindfulness training enhances face working memory: evidence from the drift-diffusion model

Two faces (sample) appeared at two of the four quadrants for 1000 ms. After a delayed period of 2000 ms, a test face was presented at the center of the screen for 1000 ms. Participants were asked to judge if the test face matched one of the sample faces.