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Related Experiment Videos

Noradrenaline and partial reinforcement in rats

S T Mason, H C Fibiger

    Journal of Comparative and Physiological Psychology
    |December 1, 1978
    PubMed
    Summary

    Lesions in the dorsal noradrenergic bundle (DNAB) cause resistance to extinction in rats trained with continuous reinforcement but not partial reinforcement. This suggests the DNAB is crucial for attentional processes in specific learning contexts.

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    Area of Science:

    • Neuroscience
    • Behavioral Neuroscience
    • Neuropharmacology

    Background:

    • The dorsal noradrenergic bundle (DNAB) plays a role in various cognitive functions.
    • Noradrenaline is a key neurotransmitter involved in attention and arousal.

    Purpose of the Study:

    • To investigate the role of the DNAB in extinction learning.
    • To determine if DNAB lesions affect extinction rates differently based on reinforcement schedules.

    Main Methods:

    • Lesions of the DNAB were induced using 6-hydroxydopamine.
    • Rats were trained on either a continuous reinforcement (CRF) or partial reinforcement (PR) schedule for food reward.
    • Extinction rates were measured after the reinforcement schedule was withdrawn.

    Main Results:

    • DNAB lesions significantly increased resistance to extinction in rats trained under CRF.
    • DNAB lesions did not affect extinction rates in rats trained under PR.
    • These findings confirm the dorsal bundle extinction effect but limit its scope to CRF conditions.

    Conclusions:

    • The DNAB is implicated in attentional processes during extinction learning, particularly in continuously reinforced tasks.
    • The results challenge the hypothesis that the DNAB is involved in mediating the effects of frustrative nonreward.

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