Intensity dependence of auditory evoked dipole source activity in polydrug ecstasy users: evidence from an 18 months longitudinal study

Journal of Psychopharmacology
Jörg DaumannEuphrosyne Gouzoulis-Mayfrank

Abstract

Numerous animal studies have been able to demonstrate neurotoxic damage to central serotonergic systems after exposure to 3,4-methylenedioxymethamphetamine (MDMA, ecstasy). It has been suggested that a high loudness dependence of auditory evoked potentials (LDAEP) and, particularly, of the tangential N1/P2 source activity is associated with a low functioning of serotonergic activity. Therefore, the LDAEP may be used as a non-invasive indicator for a possible neurotoxic damage caused by the long-term use of ecstasy in recreational users. We recorded auditory evoked potentials (AEP) with a passive listening paradigm in 18 polydrug ecstasy users at baseline (t1) and after 18 months (t2). Several aspects of ecstasy use, such as frequency of use, cumulative lifetime dose or period of abstinence were associated with the LDAEP for several tangential dipoles at both measuring times. However, we failed to demonstrate any significant relationship between drug use reported at follow-up and AEP changes from baseline to follow-up. Despite some incertitude these data suggest, yet do not unambiguously con.rm, the hypothesis that abstinent ecstasy users present with diminished central serotonergic activity. This feature of information processi...Continue Reading

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Citations

Jun 19, 2009·Clinical EEG and Neuroscience·Natalie A CeballosRebecca J Houston
Jul 17, 2008·Journal of Rehabilitation Research and Development·Linda J MetzgerScott P Orr
Nov 28, 2007·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·T HenschB Brocke
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Jul 11, 2007·The Australian and New Zealand Journal of Psychiatry·Edmund SilinsPaul Dillon
Mar 3, 2006·Journal of Psychopharmacology·Andy C Parrott, Charles A Marsden

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