An Acoustic Analysis Of Cannabis-Intoxicated Speech
Speech from medicinal users of cannabis was compared before and after the consumption of cannabis to determine whether cannabis-intoxication produces salient acoustic correlates within the speech stream. Eight participants completed a variety of elicitation tasks (reading, interviews, storyboards, sustained vowel phonation) before and after the consumption of cannabis. Measurements of voice-onset time (VOT), prosodic trajectory, and acoustic quality (jitter / shimmer) suggest that cannabis-intoxication results in a distinct acoustic profile. Intoxicated speech was characterized by significant and substantial increases to the variability of VOT, altered prosodic expression (reduced range and flatter trajectories), and decreased shimmer. These findings have implications for the utility of automatic detection methods in distinguishing cannabis-intoxication from the speech stream, which may be useful for medical or legal purposes. Furthermore, these findings may provide insight into the psychological and physiological effects of cannabis intoxication.
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