Just to read by abstract
Herman, Richards, Wolz (1984) Comprehension of sentences by bottlenosed dolphins (good to pay attention to articles that cover problems first – this is typical scientific mistake that people often discover what has been discovered and discuss what has been discussed earlier; but as I am a creative scientist with achievements I can add that sometimes we can discover that even at the very first considerations someone was wrong and sometimes like when I wrote about assumption of NPV method in economics – thousands of authors of most popular in the world method to value investments projects simply repeated that mistake – i discovered it and extended considerations to show what is the best light to see whole concept in order to defend it – if we do not want to totally reject as mistaken from wrong assumptions).
Herman, Uyeyama, Pack (2008) Bottlenose dolphins understand relationships between concepts
Auditory masking as a scientific topic (EN)
Just to start with https://en.wikipedia.org/wiki/Auditory_masking
Similar human problems