Figure 3 : Experimental paradigm.

From: Mona Lisa is always happy – and only sometimes sad

Figure 3

Each of the 9 Mona Lisa variants25 in a block was presented for maximal 6 seconds. Within this time window the participants were told to first indicate the perceived emotional facial expression of Mona Lisa (“Perception Task”) and to subsequently rate the confidence of their response (“Confidence Rating Task”). After the second response (or after 6 s in case of no response) the next stimulus variant appeared. Each block was repeated for 30 times and the presentation order within block was randomized. Happy and sad variants of the original Mona Lisa painting were created in Dr. Kornmeier’s lab.