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The biological sex of a researcher can act as an extraneous variable by unintentionally influencing participant behavior. Because male and female experimenters often interact differently with subjects—and subjects respond differently to them—this variation can confound study results. For instance, in a pain perception study by Ibolya, Brake, and Voss (2004), participants immersed their hands in icy water longer when the experimenter was of the opposite sex, demonstrating that researcher characteristics must be controlled to prevent noise in the data.

Experimenter's Sex as an Extraneous Variable

In a 2004 study on pain perception, researchers K. Ibolya, A. Brake, and U. Voss asked participants to immerse their hands in icy water for as long as they could tolerate. The study provided evidence that the experimenter's sex can act as an extraneous variable: male participants tolerated the pain longer when tested by a female experimenter, and female participants tolerated it longer when tested by a male experimenter.

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