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The placebo effect in reading performance: A cross-over experimental study.

Sandro Franceschini1, Sara Bertoni2, Patrik Pluchino1

  • 1Department of General Psychology, University of Padua, Padova, Italy.

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Summary
This summary is machine-generated.

Placebo effects, driven by positive expectations, can enhance reading speed for words and pseudowords. Negative expectations (nocebo) did not significantly impair performance in this study.

Keywords:
NoceboNoradrenalinePersonality traitsPlaceboReading performanceReading training

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Area of Science:

  • Cognitive Neuroscience
  • Psychology

Background:

  • Placebo and nocebo effects are known to influence perceptual and sensorimotor functions by altering brain chemistry and circuitry.
  • The impact of these effects on higher-level cognitive processes like reading remains less understood.

Purpose of the Study:

  • To investigate whether placebo and nocebo effects can modulate high-level cognitive functions, specifically single word reading and pseudoword decoding.
  • To examine the role of explicit and implicit expectation induction on reading performance.

Main Methods:

  • A within-subject experiment involving 102 young adults wearing sham glasses.
  • Induction of positive and negative expectations through verbal instructions and computerized feedback.
  • Measurement of subjective effects, personality traits (Big Five), pupil size, and heart rate.

Main Results:

  • Explicit placebo expectations significantly enhanced word and pseudoword reading speed.
  • Negative expectations did not show a significant impairment in reading speed within the study's task duration.
  • No significant differences were found in heart rate or pupil size between placebo and nocebo conditions.
  • Participant-reported subjective effects indicated perceived influence of the sham glasses on performance.

Conclusions:

  • Placebo effects can positively modulate high-level cognitive tasks such as reading speed.
  • The findings suggest a need to consider and harness placebo effects in clinical settings and reading interventions.
  • Further research is needed to explore potential nocebo effects in tasks of longer duration.