In results in L1 that distinguishes accuracy in acoustic/speech sound perception, we can either say the salient different result of perceiving full CV words and CV transitions is because of the normalization of acoustic sound into speech sound category through extensive statistical learning; or, alternatively, we can also say that gestures are the distal objects that humans perceive directly as categories.
in L2, it is easier to see whether pure acoustic sounds are perceived as linguistic sound, or if gestures play a part too.