Voice Technology to Identify Opioid Use

This study investigated whether changes in a person's voice could be used to identify opioid use in individuals with opioid use disorder (OUD). The opioid epidemic continues to present significant public health, medical, and social challenges in the United States and globally. Clinicians treating patients with OUD often need to determine whether a patient may be actively using opioids, intoxicated, withdrawing, or responding appropriately to treatment. Current approaches commonly rely on self-reporting, interviews, behavioral observations, urine toxicology testing, and clinical judgment. While these methods can be useful, they may also be subjective, resource-intensive, intermittent, invasive, or difficult to implement frequently in routine care settings.

The purpose of this project was to evaluate whether speech analysis technology could provide a more objective, scalable, and non-invasive approach for monitoring opioid-related physiological changes. Human speech is a complex neuromuscular activity that depends on the coordinated function of the brain, respiratory system, vocal tract, and facial musculature. Opioids can affect cognitive processing, respiratory patterns, motor coordination, reaction time, sedation levels, and muscle control, all of which may influence characteristics of speech production. Prior scientific literature has suggested that physiological and neurological conditions can sometimes produce measurable changes in speech patterns. This project sought to determine whether similar measurable changes could be associated with opioid use.

The study focused specifically on analyzing speech recordings from participants with opioid use disorder. Researchers collected voice samples and applied computational analysis methods to evaluate whether acoustic and temporal speech features could distinguish opioid-related states. The project used signal-processing techniques and machine learning methods to analyze a range of speech characteristics that may reflect physiological effects associated with opioid exposure.

Evaluated speech features included acoustic biomarkers commonly studied in speech analytics research. The project investigated whether combinations of these features could be used to identify patterns associated with opioid intoxication or withdrawal.

A major goal of the study was to assess the feasibility of using speech as a physiological biomarker for opioid use monitoring. Researchers evaluated whether machine learning models could reliably differentiate between opioid-related conditions using speech data alone.

The primary objective of the study was to assess the accuracy and feasibility of voice-based biomarkers for identifying opioid use in individuals with OUD. The study also aimed to better understand the limitations and challenges associated with speech-based impairment detection.

As part of the research effort, the project contributed to the development of internal workflows and analytic infrastructure for handling sensitive speech data. Researchers established preprocessing pipelines for audio ingestion, normalization, feature extraction, labeling, quality control, and model evaluation.

The work generated technical findings regarding the feasibility of speech-based opioid detection and highlighted several scientific and engineering challenges associated with this problem space. These included variability in recording environments, differences between speakers, background noise, individual physiological differences, and the difficulty of isolating opioid-related speech effects from unrelated sources of variation. The study also reinforced the challenges associated with developing generalized machine learning classifiers for complex real-world physiological states using speech data alone.

Although the project explored the potential for objective opioid monitoring through speech analysis, the research did not produce a clinically deployable classifier during the study period. However, the project generated valuable information regarding the limitations, feasibility considerations, and technical barriers associated with speech-based opioid detection approaches. These findings informed future research planning, technology-development decisions, and evaluation strategies for impairment-detection technologies.

Overall, the project contributed to ongoing research efforts exploring non-invasive digital biomarkers for substance-use monitoring. The findings from this work may help guide future investigations into speech analytics, physiological monitoring, and machine learning approaches for identifying substance-related impairment and supporting clinical decision-making in addiction medicine settings.

Inclusion criteria

• Male or female
• At least 18 years old
• Be an active patient in treatment at the Volpicelli Center
• Have a diagnosis of Opioid Use Disorder (OUD)
• Ability to read English
• Able to comprehend and are willing to sign the informed consent form and are able to adhere to the protocol

Exclusion criteria

• Severe psychiatric comorbidity
• A chronic medical condition that interferes with speaking (note: Acute conditions that impair speech or hearing will not be considered exclusionary, but testing will be deferred until the temporary condition has been resolved)
• Non-fluency in the study language (English)