The behavioural effects of levallorphan, cyprenorphine (M 285) and amphetamine on repeated Y-maze performance in rats

@article{Wray2004TheBE,
  title={The behavioural effects of levallorphan, cyprenorphine (M 285) and amphetamine on repeated Y-maze performance in rats},
  author={Samuel R. Wray and Alan Cowan},
  journal={Psychopharmacologia},
  year={2004},
  volume={21},
  pages={257-267}
}
The effects of levallorphan and cyprenorphine (M 285) were studied on repeated Y-maze performance in rats. It was postulated that these narcotic antagonists—implicated as psychotomimetics—would disrupt the experiencing process and augment fear-motivated behaviour. These compounds produced differential effects on behaviour. Levallorphan induced bizarre-excitation and disrupted habituation; cyprenorphine was ineffective in these respects. No augmentation of fear-motivated behaviour was observed… 
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