Comprender la ciencia detrás de VIPRE

por Lawrence Rice, CMECI

Consultor / Aplicación de la ley jubilada

Examinador / Instructor de estrés de voz

24 de octubre de 2025

For decades, investigators have examined whether features of speech can reveal stress or support investigative interviewing. Early commercial systems drew on vocal micro-tremor theory. Research questioning that theory should be evaluated by the particular signal, system, task, and study conditions examined.

VIPRE describes its approach as vagal stress analysis, informed by research on autonomic activity and vocal production. That physiological rationale is distinct from evidence that an exact commercial system reliably identifies stress or deception. The cited background research does not establish superior AISIS or VASIS accuracy.

De la teoría del microtemblor a la ciencia moderna

The micro-tremor theory proposed that low-frequency physiological tremors could be detected through speech. Studies cited in this article have raised questions about:

The identification of consistent micro-tremor patterns in normal speech
The relationship between proposed tremors and deception
The adequacy of the scientific support for particular commercial interpretations

Debido a estas debilidades, los sistemas basados en microtemblores como CVSA han sido ampliamente cuestionados.

El papel del nervio vago en el estrés y la voz

Research examines how autonomic activity, breathing, and vocal control interact under stress. Relevant aspects of vocal production include:

Cierre de cuerdas vocales
Resonancia
Estabilidad de la fonación

Physiological changes can influence acoustic features of speech. The studies cited here provide background on those relationships; they do not by themselves validate VIPRE performance or establish greater accuracy or reliability than another system.

VIPRE y el modelo de análisis de estrés vagal

VIPRE presents AISIS and VASIS as investigative support tools for trained examiners. A stress-related indication is not proof of deception, honesty, guilt, or intent. Examiners must consider question wording, recording conditions, the interview context, and independent evidence.

VIPRE Desarrollado por VASIS

Lanzado en 2006, VASIS (Sistema de índice de puntuación autónomo virtual) proporciona:

Resultados codificados por colores y basados en patrones
Puntuación de gráficos automatizada
Borrar los patrones "No hay estrés indicado" (negro) y "Estrés indicado" (rojo)
Soporte para las etapas de preprueba, examen y posprueba

These functions organize the examination for examiner review. A color-coded chart or automated score is a product output, not independent confirmation of an interviewee’s stress level or credibility.

Compare proposed models and evidence

Característica	CVSA	AISIS and VASIS
Proposed mechanism	Micro-tremor interpretations have been questioned in the cited literature.	VIPRE describes a vagal-autonomic model; the mechanism requires evaluation separately from product performance.
Research scope	Findings must identify the exact CVSA version, task, population, and study conditions.	General physiology and speech research do not by themselves validate AISIS or VASIS.
Interpretation	A voice-derived indication does not establish deception.	A stress-related indication does not establish deception, honesty, guilt, or intent.
Product evaluation	Ask for independent testing of the exact system and intended task.	Ask for independent testing of the exact system and intended task.
Safeguards	Use trained examiners, documented procedures, and independent corroboration.	Use trained examiners, documented procedures, and independent corroboration.

VIPRE presents its systems for structured investigative workflows. Any proposed use requires evaluation of the exact system, intended task, applicable law, and agency policy. Potential settings include:

Investigaciones
Programas de detección
Entrevistas de inteligencia
Evaluaciones previas al empleo

La atención se centra en la evaluación objetiva del estrés, no en suposiciones sobre culpa o intención.

Conclusión

Speech and autonomic physiology research provide a basis for studying stress-related vocal changes. They do not establish that a particular device detects deception or validates its operational performance. AISIS and VASIS should be evaluated using evidence specific to each product, population, and task, with outcomes checked against independent evidence.

Referencias

Haddad, D. B., Walter, S. E., Ratley, R. J. y Smith, MF (2002). Investigación y evaluación de la tecnología de análisis del estrés de la voz. Instituto Nacional de Justicia, Departamento de Justicia de Estados Unidos.
Hecker, MHL (1988). Aplicaciones del análisis del estrés de la voz. Métodos, instrumentos y computadoras de investigación del comportamiento, 20(2), 151-162.
Hollien, H., Hicks, JW y Martin, CA (1974). Evaluación del estrés de la voz: una nueva herramienta para la comunidad policial. Revista de ciencia y administración policial, 2(4), 448-452.
Ludlow, CL (2013). Control del sistema nervioso central de la voz y la deglución. Revista de investigación clínica, 123(7), 2731-2737.
O'Hair, H. D., Cody, M. J. y Behnke, RR (1985). Detección de mentiras basada en la comunicación: un modelo de base empírica. Investigación en comunicación humana, 12(2), 189-201.
Porges, SW (2007). La perspectiva polivagal. Psicología Biológica, 74(2), 116-143.
Roy, N. y Bless, DM (2000). Rasgos de personalidad y factores psicológicos en la patología de la voz: una base para futuras investigaciones. Revista de investigación del habla, el lenguaje y la audición, 43(3), 737-748.
Shipp, T. e Izdebski, K. (1981). Current evidence for the existence of laryngeal microtremor. Revista de Ciencias Forenses, 26(3), 501-505.
Van Puyvelde, M., Neyt, X., McGlone, F., and Pattyn, N. (2018). Voice Stress Analysis: A New Framework for Voice and Effort in Human Performance. Frontiers in Psychology, 9, 1994.