Figure 1. Examples of visual stimuli.

(A) and (B) were included in the unambiguous image set, while (C) and (D) in the ambiguous set. (C) was named, for example, as ‘fish’, ‘whale’ or ‘submarine’. (D) as ‘human’, ‘hair’, or ‘pineapple’.

(A) and (B) were included in the unambiguous image set, while (C) and (D) in the ambiguous set. (C) was named, for example, as ‘fish’, ‘whale’ or ‘submarine’. (D) as ‘human’, ‘hair’, or ‘pineapple’.