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Related Experiment Videos

Frequent reward eliminates differences in activity between hyperkinetic rats and controls

T Sagvolden1, M A Metzger, G Sagvolden

  • 1Department of Neurophysiology, University of Oslo, Norway.

Behavioral and Neural Biology
|May 1, 1993
PubMed
Summary

Spontaneously hypertensive rats, an animal model for attention-deficit hyperactivity disorder (ADHD), show hyperactivity at low reinforcement rates. Increasing reinforcer frequency may help normalize ADHD-like behaviors.

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Area of Science:

  • Neuroscience
  • Behavioral Science
  • Animal Models

Background:

  • Spontaneously hypertensive rats (SHR) exhibit hyperactivity and attention deficits, making them a potential animal model for attention-deficit hyperactivity disorder (ADHD).
  • Altered reinforcement (reward) processes are hypothesized to underlie hyperactivity in SHR and ADHD.

Purpose of the Study:

  • To investigate and compare basic reinforcement and response processes between hyperactive SHR and control Wistar-Kyoto (WKY) rats.
  • To elucidate the role of reinforcement schedules in the behavioral differences observed in ADHD models.

Main Methods:

  • Behavioral analysis of reinforcement and response rates in SHR and WKY rats under varying schedules of reinforcement.
  • Operant conditioning paradigms to assess response maintenance and reinforcement sensitivity.

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Main Results:

  • Differences in response rates between SHR and WKY rats were observed primarily under conditions of infrequent reinforcement.
  • SHR required fewer reinforcers per minute to sustain high response rates compared to WKY rats.
  • At high reinforcement rates, asymptotic response rates were similar between the two strains, suggesting strain differences are context-dependent.

Conclusions:

  • The heightened responding in SHR at low reinforcement rates may indicate a broader sensitivity to reinforcement, not limited to primary rewards.
  • Findings suggest that adjusting reinforcement schedules, specifically increasing frequency, could potentially mitigate ADHD-like behaviors.