Separate and combined effects of a benzodiazepine (alprazolam) and noise on auditory brainstem responses in man.
Auditory brainstem responses (ABRs) were recorded in 60 male or female, anxious or anxiety-free university students, before and after separated or simultaneous intake of alprazolam and exposure to noise. A significant increase of the latencies of the ABRs was found when subjects took alprazolam. This effect is consistent with the presence of gamma-aminobutyric acid (GABA), one of the neurotransmitters at terminals of cochlear efferent fibres A significant increase of the latencies was observed after noise alone. In subjects taking alprazolam when they are exposed to noise, the effect of noise on the ABR latencies is reduced, but not abolished. The effects of alprazolam on the ABR are consistent with the presence of GABA in the medulla and pons. Significant effects of noise upon III-V and I-V intervals suggest that auditory 'fatigue' may involve a retrocochlear component. Differences due to sex appear to be abolished by anxiety.
Parrot
J
J
Department of Psychophysiology, University of Burgundy, France.
Petiot
J C
JC
Morizot
S
S
Petiot
M T
MT
Smolik
H J
HJ
D000293:Adolescent; D000328:Adult; D000525:Alprazolam / Q000494:pharmacology*; D014151:Anti-Anxiety Agents / Q000494:pharmacology*; D001007:Anxiety / Q000503:physiopathology; D001305:Auditory Fatigue / Q000187:drug effects* / Q000502:physiology; D016057:Evoked Potentials, Auditory, Brain Stem / Q000187:drug effects* / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008526:Medulla Oblongata / Q000187:drug effects / Q000503:physiopathology; D009622:Noise / Q000009:adverse effects*; D011149:Pons / Q000187:drug effects / Q000502:physiology; D011930:Reaction Time / Q000187:drug effects / Q000502:physiology; D012016:Reference Values; D005680:gamma-Aminobutyric Acid / Q000502:physiology
D014151:Anti-Anxiety Agents; D005680:gamma-Aminobutyric Acid; D000525:Alprazolam