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A Visual Analogue Scale technique to measure global vigor and affect.
1Human Chronobiology Research Program, Sleep Evaluation Center, Western Psychiatric Institute and Clinic, University of Pittsburgh School of Medicine 15213.
Psychiatry Research
|January 1, 1989
Summary
This study introduces a Visual Analogue Scale (VAS) for measuring mood and activation, yielding Global Vigor (GV) and Global Affect (GA) scores. The VAS effectively differentiates between healthy individuals and depressed patients, showing reliable mood changes.
Area of Science:
- Psychological assessment
- Psychometric validation
- Subjective well-being measurement
Background:
- Assessing mood and subjective activation is crucial in psychological research and clinical practice.
- Existing methods may lack ease of administration or sensitivity to subtle changes.
- Temporal isolation studies provide a unique environment to evaluate mood and activation dynamics.
Purpose of the Study:
- To introduce and validate a Visual Analogue Scale (VAS) for assessing mood and subjective activation.
- To establish the reliability and validity of the Global Vigor (GV) and Global Affect (GA) measures derived from the VAS.
- To examine the sensitivity of GV and GA to factors like jet lag, diurnal variation, and prolonged seclusion.
Main Methods:
- Development of an easily administered Visual Analogue Scale (VAS) yielding Global Vigor (GV) and Global Affect (GA) scores (0-100).
- Administration of the VAS approximately six times daily to 38 healthy controls and 6 depressed patients in temporal isolation studies.
- Statistical analysis of 5,734 control and 575 patient sessions to assess frequency distributions, validity, and reliability.
Main Results:
- GV and GA distributions approximated Gaussian curves in both groups, indicating proper instrument completion.
- Depressed patients exhibited significantly lower GV (0.6 SD) and GA (1.5 SD) compared to controls, confirming scale validity.
- GV measures in controls were sensitive to jet lag and diurnal variations, demonstrating reliability and validity.
- GA measures showed a monotonic decline during prolonged voluntary seclusion (>50 days), tracking mood changes and confirming reliability.
Conclusions:
- The Visual Analogue Scale (VAS) provides a reliable and valid method for assessing mood and subjective activation.
- Global Vigor (GV) and Global Affect (GA) are sensitive to psychological states, environmental factors, and clinical conditions like depression.
- The VAS technique offers a practical tool for researchers and clinicians studying subjective experiences.