The French word “bulle” (“bubble” in English) sampled using 332 bubbles, which was the average number of bubbles used by the participants in the first half of the experimental sessions.

Only the horizontal strip of the stimulus that contains letter signal is displayed. Each one of the 24 stimulus frames has a duration of 8.33 ms, for a total stimulus duration of 200 ms. The magnified portion of the stimulus shows a complete bubble cycle.