Relationship between changes in zebra finch song and human speech/voice deficits in PD.

This table compares significant findings from our finch PD model to the perceptual analogs in humans with PD. In humans, studies generally focus on changes in pitch, loudness, voice quality, and rate of speech with individual differences reported across subjects (see references on specific acoustic characteristics and measurements) [6–17,30,67,68,92–98]. Meanwhile, studies in zebra finches focus on the individual acoustic features of syllables in their birdsong, similarity of syllables within and across song syllable renditions, and the amount of song produced [38,39,42,44,47,50–56,58–60,69,70,82].