Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

The Placebo Effect01:54

The Placebo Effect

6.8K
The placebo effect occurs when people's expectations or beliefs influence or determine their experience in a given situation. In other words, simply expecting something to happen can actually make it happen.
6.8K
Placebos in Research06:58

Placebos in Research

12.2K
Source: Laboratories of Gary Lewandowski, Dave Strohmetz, and Natalie Ciarocco—Monmouth University
12.2K
Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies05:22

Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies

5.7K
We present a protocol to dissociate the intertwining factors of integrative difficulty and unexpectedness in semantically anomalous sentences by applying multiple repetitions to enhance participant's expectancy for anomalous sentences. The dissociation helps to investigate the major contributor of elicited event-related potentials (ERP) effects such as N400 in language...
5.7K
Expected Value01:15

Expected Value

7.4K
The expected value is known as the "long-term" average or mean. This means that over the long term of experimenting over and over, you would expect this average. The expected average is represented by the symbol μ. It is calculated as follows:
7.4K
Quantitative Measurement of the Immune Response and Sleep in Drosophila12:16

Quantitative Measurement of the Immune Response and Sleep in Drosophila

15.9K
To understand a link between the immune response and behavior, we describe a method to measure locomotor behavior in Drosophila during bacterial infection as well as the ability of flies to mount an immune response by monitoring survival, bacterial load, and real-time activity of a key regulator of innate immunity,...
15.9K
Polygraphic Recording Procedure for Measuring Sleep in Mice08:45

Polygraphic Recording Procedure for Measuring Sleep in Mice

25.2K
The recording of electroencephalogram (EEG) and electromyogram (EMG) in freely behaving mice is a critical step to correlate behavior and physiology with sleep and wakefulness. The experimental protocol described herein provides a cable-based system for acquiring EEG and EMG recordings in...
25.2K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Predicting continuous outcomes: Some new tests of associative approaches to contingency learning.

PLoS computational biology·2026
Same author

Psychometric evaluation of interpretation bias measures for pain.

The journal of pain·2026
Same author

Approaches to psychological pain management: what is the way forward?

Pain·2026
Same author

Death anxiety predicts fear of progression in people with rheumatic conditions.

British journal of health psychology·2026
Same author

Momentary assessment of mental imagery and pain-related psychological factors in youth with chronic pain.

Pain·2026
Same author

Everybody hurts: behavioural, autonomic, and neuro-physiological correlates of directly compared to socially learnt nocebo hyperalgesia.

Pain·2026
Same journal

Usability, feasibility, and acceptability of a smartphone-supported behavioral activation intervention for patients with advanced cancer.

Annals of behavioral medicine : a publication of the Society of Behavioral Medicine·2026
Same journal

Exploring quality of life impact on cancer screening in Black subgroups.

Annals of behavioral medicine : a publication of the Society of Behavioral Medicine·2025
Same journal

Correction to: Daily, prospective associations between sleep architecture and affect: insights from Bayesian multilevel compositional data analysis.

Annals of behavioral medicine : a publication of the Society of Behavioral Medicine·2025
Same journal

Trauma, posttraumatic stress disorder, and incident chronic disease.

Annals of behavioral medicine : a publication of the Society of Behavioral Medicine·2025
Same journal

Changes in physical activity 1 year after breast cancer diagnosis and associations with patient-reported outcomes: results from the AMBER cohort.

Annals of behavioral medicine : a publication of the Society of Behavioral Medicine·2025
Same journal

Visual attention and memory retention of cannabis warning labels: an eye-tracking experiment with young adults.

Annals of behavioral medicine : a publication of the Society of Behavioral Medicine·2025
See all related articles

Related Experiment Video

Updated: Jan 19, 2026

The Placebo Effect: Definition, Examples
01:54

The Placebo Effect: Definition, Examples

6.8K

Choice, Expectations, and the Placebo Effect for Sleep Difficulty.

Valerie Yeung1, Louise Sharpe1, Andrew Geers2

  • 1School of Psychology, University of Sydney, Sydney, Australia.

Annals of Behavioral Medicine : a Publication of the Society of Behavioral Medicine
|September 11, 2019
PubMed
Summary
This summary is machine-generated.

Choice did not enhance placebo effects for sleep difficulty over a 7-day period. Expectancy, not choice, drove improvements in insomnia severity and sleep quality, suggesting choice benefits are context-specific.

Keywords:
ChoiceExpectancyInsomniaPlacebo effectSleep

More Related Videos

Designing Experiment to Determine the Extent of Placebo Effects
06:58

Designing Experiment to Determine the Extent of Placebo Effects

Published on: April 30, 2023

12.2K
Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies
05:22

Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies

Published on: May 9, 2019

5.7K

Related Experiment Videos

Last Updated: Jan 19, 2026

The Placebo Effect: Definition, Examples
01:54

The Placebo Effect: Definition, Examples

6.8K
Designing Experiment to Determine the Extent of Placebo Effects
06:58

Designing Experiment to Determine the Extent of Placebo Effects

Published on: April 30, 2023

12.2K
Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies
05:22

Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies

Published on: May 9, 2019

5.7K

Area of Science:

  • Psychology
  • Sleep Medicine
  • Behavioral Science

Background:

  • Choice can enhance placebo effects in single-session treatments.
  • Its role in longer-term treatments with established placebo effects is unclear.

Purpose of the Study:

  • To investigate if choice between placebo treatments enhances placebo effects for sleep difficulty over one week.
  • To compare single or daily choice against no choice and no treatment.

Main Methods:

  • 117 volunteers with sleep difficulty were randomized into four groups (choice vs. no choice, placebo vs. no treatment).
  • Outcomes included self-reported insomnia severity, fatigue, total sleep time (TST), sleep onset latency (SOL), perceived sleep quality (PSQ), and treatment satisfaction.
  • Objective TST and SOL were measured via actigraphy in a subsample.

Main Results:

  • Placebo treatment significantly improved insomnia severity, fatigue, and PSQ.
  • No significant benefit of choice on any sleep outcome was observed.
  • Expectancy fully mediated placebo effects for insomnia severity and PSQ, and partially for fatigue.

Conclusions:

  • Choice does not appear to enhance placebo effects for sleep difficulty over a 7-day period.
  • The benefits of choice on placebo effects may be limited to specific circumstances.
  • Expectancy plays a crucial role in mediating placebo effects for sleep-related outcomes.