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Related Experiment Videos

FR discrimination training effects in SHR and microencephalic rats

P S Loupe1, S R Schroeder, R E Tessel

  • 1Department of Pharmacology and Toxicology, School of Pharmacy, University of Kansas, Lawrence 66045-2505, USA.

Pharmacology, Biochemistry, and Behavior
|August 1, 1995
PubMed
Summary

Spontaneously hypertensive rats (SHR) and methylazoxymethanol-induced (MAM) rats showed learning deficits that depended on task difficulty. Experience helped overcome these deficits, suggesting potential for reversing prenatal brain damage effects.

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Developmental Neuroscience

Background:

  • Spontaneously hypertensive rats (SHR) and methylazoxymethanol-induced (MAM) rats are models for developmental disabilities.
  • Understanding learning deficits in brain-damaged models is crucial for developing interventions.

Purpose of the Study:

  • To examine fixed-ratio (FR) discrimination learning in SHR, MAM, and control rats.
  • To investigate the impact of task difficulty and experience on learning deficits.
  • To explore potential for reversing prenatal brain damage consequences.

Main Methods:

  • Rats (SHR, MAM, Sprague-Dawley controls) underwent fixed-ratio discrimination tasks with varying difficulty levels.
  • Learning performance and hippocampal weight were measured.

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  • Position reversal learning was assessed.

    • Main Results:

    • SHR and MAM rats learned incrementally difficult tasks with parallel error increases.
    • Non-incremental task difficulty initially caused deficits in SHR and MAM rats, but they adapted.
    • Training elevated hippocampal weight in MAM rats.
    • Learning deficits were dependent on initial task difficulty and improved with experience.

    Conclusions:

    • Findings challenge the notion that MAM and SHR models represent distinct human developmental disabilities.
    • Learning deficits in brain-damaged organisms are influenced by initial task difficulty and can be overcome.
    • Training may antagonize prenatal-induced hippocampal hypoplasia and its effects.