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Stimuli and experimental design. (a) Five types of adapting stimuli—neutral face, happy face, neutral tone sound, laughter sound, and happy face with laughter sound—were followed by a series of morphed test faces from sad to happy. (b) Participants judged if a test face was happy or sad by pressing the response button. Adapting stimuli were presented for 4 s followed by a 0.5-s inter-stimuli interval. The test face was then presented for 0.2 s.
