Related Experiment Video
Updated: Aug 8, 2026

A Simple Way to Measure Ethanol Sensitivity in Flies
Published on: February 19, 2011
End-position nystagmus as an indicator of ethanol intoxication
1Central Texas Analytical Consultants, P.O. Box 569, Eddy, Texas 76524-0569, USA.
Abstract:
The Horizontal Gaze Nystagmus test is used by law enforcement agencies in the United States to determine whether drivers are intoxicated. It has a high baseline error and a dose/response relationship that varies greatly according to whether the subject's blood alcohol concentration is rising or falling. Confusion exists among practitioners of the test about whether it quantifies alcohol concentration or evaluates impairment. Fatigue exacerbates one component of the HGN test, end-position nystagmus. Video tapes recorded by cameras in police vehicles revealed that police officers rarely comply with the minimum requirements of the nystagmus examination procedures for which they were trained and certified.
More Related Videos
Related Concept Videos
¹H NMR of Labile Protons: Temporal Resolution
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
Equilibrium and Balance
Hepatic Encephalopathy

