Electrophysiological correlates of the mesoaccumbens system during male rat sexual behaviour

Physiology & Behavior
Miguel Angel GuevaraMarisela Hernández-González

Abstract

It is well known that during the male rat sexual interaction different levels of arousal or sexual motivation are involved and that these motivational changes are associated with variations in the level of dopamine (DA); however, it is not yet known if these changes are associated with a different functionality of the nucleus Accumbens (Acc) and Ventral Tegmental Area (VTA), neural structures that constitute the DA mesoaccumbens system. Thus, in this study was simultaneously recorded the electroencephalogram (EEG) from the VTA and the Acc in order to determine if the EEG correlation (r) between these structures shows characteristic patterns in relation to four different conditions of sexual arousal during the male rat sexual interaction: 1) basal-quiet state (BS); 2) exposure to an inaccessible oestrous female (IF); 3) post-intromission (PI); and, 4) post-ejaculation (PE). Both Acc and VTA showed an increased relative power (RP) in the 8-12 Hz band during the PI condition as compared to the other periods. The correlation patterns between Acc and VTA were sensitive to different arousal levels involved in the male rat sexual interaction: those of the interaccumbens and intertegmental r in the 4-7 and 13-21 Hz bands decreased spec...Continue Reading

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