Behavioral and Auditory Electrophysiological Rebound as a Compensatory Response to the Reinforcing Effects of Morphine

Author(s)

Paliarin, Franciely ^{[1, 2]} ; Incrocci, Roberta Monteiro ^{[1, 2]} ; Nobre, Manoel Jorge ^{[1, 3, 2]}

Affiliation

^[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Psicol, BR-14040901 Ribeirao Preto, SP - Brazil

^[2] Inst Neurociencias & Comportamento INeC, Campus USP, BR-14040901 Ribeirao Preto, SP - Brazil

^[3] Uni FACEF, Dept Psicol, BR-14401135 Franca, SP - Brazil

• Document type: Journal article
• Source: Neuroscience; v. 392, p. 66-76, NOV 10 2018.
• Web of Science Citations: 0

Abstract

Auditory-evoked potentials (AEPs) can be modified by associative learning, where the appearance of learned compensatory responses (CCRs) may result in the emergence of drug withdrawal symptoms and relapse. Although CCRs' influence on later attentive and cognitive domains has been extensively examined, contextual conditioned tolerance occurring in preattentive mechanisms operating at earlier stages of information processing has remained largely unexplored. To extend our knowledge on this subject, compensatory changes on the motor and emotional aspects of behavior evoked by contextual cues were investigated with an electronic open field in morphine-pretreated rats challenged with two morphine overdoses (40 and 80 mg/kg). CCRs influence on the AEPs recorded in the central nucleus of the inferior colliculus (CIC) was analyzed with the help of a field potential recording device and a two-chamber shuttle box placed inside a Faraday cage system. The emergence of electrophysiological CCRs was analyzed by recording AEP latency and amplitude elicited in the central nucleus of the IC (CIC) with the aid of a field potential recording device and a two-chamber shuttle box placed inside a Faraday cage system. Behavioral analysis indicated that CCRs ensue in non-familiar contexts. Electrophysiological data revealed increases in the amplitude of AEPs evoked in a non-familiar context. Our results indicate that behavioral learning responses emerge following Pavlovian conditioning even with the use of low and regular doses of morphine over a short-term treatment. Changes in the CIC electrophysiology may indicate that the development of drug dependence occurs covertly in the early stages of sensory information processing. (C) 2018 IBRO. Published by Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 14/23690-5 - Behavioral, psychophysiological and neurochemical changes underlying withdrawal from chronic treatment with the dissociative anesthetic ketamine
• Grantee: Manoel Jorge Nobre Do Espirito Santo
• Support Opportunities: Regular Research Grants