Language, Individual & Society, Volume 19, 2025

Rezumat: This research investigates the connection between voice characteristics and personality traits, proposing that shared principles of harmony underlie both music and speech perception. Personality was assessed using both self-report and external ratings based on the NEO Five-Factor Inventory. The perceptual evaluation involved analysing three types of speech samples: a sustained vowel sound [a], a reading passage, and spontaneous speech. To deepen auditory insights, acoustic features of the recordings were examined using the software PRAAT, identifying specific vocal markers tied to individual personality dimensions. The speech signals were also transformed into musical notation via Neuratron AudioScore Professional to analyse pitch intervals and distinguish between harmonic and disharmonic transitions. Findings revealed strong correlations- particularly involving extraversion and neuroticism - between vocal parameters and personality. Key indicators included pitch (F0), pitch variability, jitter, shimmer, harmonics-to-noise ratio (HNR), energy distribution, articulation clarity, and consonance/dissonance in speech melody. Notably, introverted or emotionally unstable individuals tended to show higher values in F0, jitter, shimmer, and HNR, whereas emotionally stable and extroverted individuals displayed greater pitch variability and more energy in higher frequencies. Features like articulation precision and melodic pitch transitions also played vital roles in distinguishing personality profiles. The study enhances our understanding of vocal expression’s influence on perception and suggests applications in speech analysis technology, recruitment processes, psychological counselling, and career guidance.