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Practice effects in nutrition intervention studies with repeated cognitive testing.

Lynne Bell1, Daniel J Lamport1, David T Field1

  • 1School of Psychology and Clinical Language Sciences, University of Reading, Earley Gate, Whiteknights, Reading, UK.

Nutrition and Healthy Aging
|June 29, 2018
PubMed
Summary
This summary is machine-generated.

Practice effects significantly impact cognitive task performance, even in healthy adults. Researchers recommend using alternate task forms and a familiarization visit to minimize these effects in nutrition intervention studies.

Keywords:
Cognitionmethodologynutrition interventionpractice effects

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Area of Science:

  • Cognitive Neuroscience
  • Nutritional Science
  • Psychometrics

Background:

  • Growing interest in nutrition interventions for cognitive enhancement.
  • Cognitive testing is crucial for intervention efficacy but susceptible to practice effects.
  • Practice effects can confound results by improving performance independent of intervention.

Purpose of the Study:

  • Investigate practice effects in common cognitive tasks.
  • Identify methods to minimize practice effects in nutrition intervention studies.
  • Enhance the reliability of cognitive assessments in research.

Main Methods:

  • Twenty-nine healthy young adults participated.
  • Completed six repetitions of a cognitive test battery over three visits.
  • Subjective mood, motivation, and task difficulty were recorded.

Main Results:

  • Significant practice effects observed across all tasks.
  • Effects attenuated over time but persisted.
  • Motivation correlated with performance on difficult tasks (serial 7s, recall).
  • No long-term negative impact on mood observed.

Conclusions:

  • Practice effects are significant, particularly between initial testing sessions.
  • Recommend alternate task forms and a familiarization visit.
  • These methods can improve statistical power in future intervention studies.