Double Blind Study Definition

Introduction on double blind study definition:

Double blind tests:

An experiment where neither the participants nor the people conducting the experiment know the critical aspects of the experiment is called a double blind test. This method is useful in eliminating results that are due to the bias of the observer or the researcher.

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Double blind study definition : Example


Let's say a soft drink manufacturer decides to modify the taste and flavor of their soft drink, and they have two different formulas. They will first test the reactions of a group of volunteers to the new soft drink. They can do this in different ways.

The volunteers are given a cup of soft drink, labeled 'A' or 'B'. 'A' contains the first soft drink, while 'B' contains the second one. In this case, the volunteers and the researchers are aware of which soft drink they are tasting. In this type of test, volunteers may be influenced by the reactions of the people around them, and by the people who serve the soft drinks.

The volunteers are given a cup of either one of the soft drinks, but without labels. However, the person who serves the drinks knows which one has 'A' and which one has 'B'. In this case, the volunteers may be guided by some non-verbal cues by the person who is serving them. This is known as a single-blind test.

The volunteers are given sealed cups which may have either drink. The drinks are sealed previously and are identified only by code numbers. In this case, the results are much more objective as the volunteers  reach a decision based only on their own judgment. This is a double blind test.

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Double blind study definition : Uses


In medicine, new drugs are tested using double blind tests in which one group of people are given pills containing the new drug, and another set get pills with the same taste and color but with no active substance.

In forensics, witnesses are asked to point out suspects from a set of photographs. If the person who is showing the witness the photographs is part of the investigation, the witness may be guided by that person. This can be avoided by using a double-blind setup, where the witness is shown the photographs by a person trained in forensics, but it not part of that particular investigation.