Prosodics - Medera

Computed by _extract_prosody(sound, audio).

Feature	Unit
`speaking_rate`	syllables / sec
`articulation_rate`	syllables / sec (excluding pauses)
`pause_count`	int
`pause_duration_mean`	seconds
`pause_duration_total`	seconds
`pitch_variability`	coefficient of variation
`intensity_mean`, `intensity_std`	dB
`prosody_confidence`	0–1

Slowed speaking rate and elongated pauses correlate with depressive psychomotor slowing.