What specific vocal features signal extraversion in neutral but not stressful settings?

This question is really about a single, surprising finding in the corpus: the vocal signature of extraversion isn't fixed — it depends entirely on the situation the speaker is in. The most direct material comes from work showing that perceived personality in speech shifts dramatically by context Does personality sound the same in stressful and neutral conversations?. In neutral interviews, a cluster of handcrafted acoustic features — the kind of measurable behaviors a researcher can point to, like pitch variation, energy, and speaking dynamics — line up with extraversion. But move the same speaker into a stressful interaction and those very features no longer read as extraversion; they instead start predicting neuroticism. The cue didn't change meaning because the person changed — it changed because the listener's read of an energetic, variable voice flips depending on whether the setting is calm or pressured.

The sharper, less obvious lesson sits underneath that: personality comes through in specific, countable behaviors rather than some holistic 'speaker style.' In that study, hand-built acoustic features actually outperformed neural embeddings — meaning the signal lives in concrete, nameable measurements, not in a black-box impression of the voice. That's why the question is answerable at all: extraversion in neutral speech is carried by particular features you can isolate, which is also exactly why those same features can be reassigned to a different trait when the emotional context shifts.

The corpus doesn't go deeper than this one note on the specific acoustic-feature list, so I won't invent one — but it does place the finding inside a wider pattern worth knowing. Several notes converge on the idea that a single linguistic or vocal channel rarely means one fixed thing. Prosodic and emotional alignment, for instance, drive warmth and trust while lexical alignment drives task efficiency — different channels, different jobs, and conflating them produces design errors Do different types of alignment serve different conversational goals?. Similarly, surface conversational cues like directness or politeness only reveal their meaning in context — the same direct question that's harmless in one opening predicts derailment in another Can opening politeness patterns predict whether conversations will turn hostile?.

The thread connecting these is that behavioral signals are situational, not intrinsic. What you'd walk away knowing that you didn't expect: the search for a stable 'sound of extraversion' is partly misguided — the acoustic fingerprint exists, but stress doesn't mask it, it reinterprets it. The feature stays; the meaning moves.