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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...

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When conducting an experiment, it is crucial to have control to reduce bias and accurately measure the dependent variables. It also marks the results more reliable. Controls are elements in an experiment that have the same characteristics as the treatment groups but are not affected by the independent variable. By sorting these data into control and experimental conditions, the relationship between the dependent and independent variables can be drawn. A randomized experiment always includes a...

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Related Experiment Video

Updated: May 19, 2026

A Protocol for the Administration of Real-Time fMRI Neurofeedback Training

A Protocol for the Administration of Real-Time fMRI Neurofeedback Training

Published on: August 24, 2017

Potential explanations for control group benefit.

Linda O Nichols¹, Jennifer L Martindale-Adams, Robert Burns

¹Veterans Affairs Medical Center, Memphis, TN 38104, USA. linda.nichols@va.gov

Clinical Trials (London, England)

|August 25, 2012

Summary

Control caregivers in a dementia study reported benefits from participation, including information and support. Assessments themselves may offer unintended benefits, highlighting the need for careful outcome measure design.

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Area of Science:

Gerontology
Psychology
Clinical Research

Background:

Clinical intervention effectiveness relies on detecting group differences.
Control group improvement can stem from nonspecific factors like attention and expectations.
Understanding benefits for control groups is crucial for accurate intervention assessment.

Purpose of the Study:

To examine perceived benefits and their sources for control caregivers in the CONNECT trial.
To investigate how participation in a dementia caregiving intervention trial impacts control group members.

Main Methods:

Qualitative analysis of control caregiver responses regarding perceived benefits post-intervention.
Interviews conducted after final data collection in the CONNECT trial.
Assessing self-reported benefits and their qualitative descriptions.

Main Results:

82% of control caregivers reported benefits, including information, support, validation, shared experience, and appreciation.
Caregivers reporting benefit had lower baseline burden, depression, and duty time.
The assessment process itself was identified as a potential source of benefit.

Conclusions:

Outcome assessment questionnaires may act as a form of intervention for control participants.
Less distressed caregivers may gain more from assessment attention.
Researchers should develop novel outcome assessment methods to avoid unintended benefits.