Effects of ethanol intoxication on speech suprasegmentals

Area of Science:

• Speech analysis
• Alcohol intoxication
• Paralinguistics

Background:

• Ethanol's effects on human behavior are variable.
• Determining intoxication through observation, particularly speech, is a complex challenge.
• Understanding the relationship between paralinguistic features and intoxication levels is crucial.

Purpose of the Study:

• To investigate if speech characteristics can reveal alcohol intoxication.
• To determine if the degree of intoxication can be quantified through speech analysis.
• To examine the relationship between paralinguistic features and varying levels of inebriation.

Main Methods:

• Selected healthy young male and female speakers across light, moderate, and heavy drinking groups.
• Recorded speech at sober state and four controlled intoxication levels (ascending and descending).
• Analyzed motor speech measures: fundamental frequency (F0), intensity, speaking rate, and nonfluencies.

Main Results:

• Statistically significant increases in F0, task duration, and nonfluencies correlated with rising intoxication.
• Minor gender differences in speech were observed but lacked statistical significance.
• Individual variations and lack of universal patterns noted, with ~20% showing no or negative changes.

Conclusions:

• Certain speech suprasegmental changes occur with increasing alcohol intoxication.
• These speech patterns are not universally predictive of intoxication due to individual variability.
• Speech analysis shows potential for detecting intoxication, but further research is needed for reliable universal application.