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Reliability and Validity

Reliability and Validity

Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways.

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Related Experiment Video

Updated: Jul 12, 2026

The Social Dimension of Stress: Experimental Manipulations of Social Support and Social Identity in the Trier Social Stress Test

The Social Dimension of Stress: Experimental Manipulations of Social Support and Social Identity in the Trier Social Stress Test

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Test-retest reliability of the simon task: a short version proposal.

Thais Cevada^1,2, Erick Conde³, Deborah Marques²

¹Post Graduate Program in Exercise and Sports Sciences (PPGCEE/IEFD), Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, Brazil.

Somatosensory & Motor Research

|November 14, 2019

Summary

A brief, 28-trial Simon task effectively elicits the Simon effect, demonstrating reliable results for assessing attentional demands and inhibitory control in participants.

Keywords:

Simon task cognition inhibitory control reaction time

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Last Updated: Jul 12, 2026

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Published on: November 19, 2015

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Area of Science:

Cognitive Psychology
Neuroscience
Psychological Assessment

Background:

The standard Simon task involves 168 trials to assess attentional demands, inhibitory control, and the perception-action cycle.
Variations exist, but the efficacy of brief Simon task versions for detecting the Simon effect remains unclear.

Purpose of the Study:

To determine if a brief, 28-trial Simon task can reliably elicit the Simon effect.
To evaluate the test-retest reliability of this shortened Simon task version.

Main Methods:

Ninety-two adults (18-30 years) completed two sessions (test and retest) of the 28-trial Simon task.
Measured reaction time (RT) and accuracy (errors) across corresponding and non-corresponding conditions.

Main Results:

A significant interaction between condition and session (test/retest) was found for RT.
Main effects for both condition and session were significant.
High test-retest reliability was observed (Cronbach's alpha = 0.883).

Conclusions:

The 28-trial Simon task is efficient in eliciting the Simon effect.
This brief version demonstrates good test-retest reliability, making it a viable assessment tool.