There is an error in the first sentence in the sixth paragraph of the Discussion section. The correct sentence is: The pattern of responses was similar for budgerigars and humans in that both groups had more /d/ responses in the low F1 onset frequency compared to the high F1 onset frequency and both showed the expected shift in category boundary.
Reference
- 1.Flaherty M, Dent ML, Sawusch JR (2017) Experience with speech sounds is not necessary for cue trading by budgerigars (Melopsittacus undulatus). PLoS ONE 12(5): e0177676 https://doi.org/10.1371/journal.pone.0177676 [DOI] [PMC free article] [PubMed] [Google Scholar]