Blinding both investigators and participants to group assignments defines which procedure:
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Answer: D. double-blind procedure
Explanation
A double-blind procedure conceals group assignments from both the human participants and the active researchers. This rigorous blinding method prevents conscious and unconscious expectations from distorting experimental measurements. By eliminating observer bias and placebo effects, researchers ensure greater internal validity for their findings. Experimental controls are essential procedures designed to minimize confounding variables in scientific studies. Placebo effects occur when participants experience measurable improvements solely due to expecting a therapeutic intervention. Researcher bias happens when investigators inadvertently cue participants to behave in ways supporting their hypotheses.
Pharmaceutical companies must conduct double-blind clinical trials to prove the genuine efficacy of new medications. Psychological researchers implement double-blind protocols during behavioral interventions to maintain objective scientific standards. Scientific journals require rigorous blinding methods to ensure published research findings are credible and reproducible. A single-blind procedure conceals group assignments only from participants while leaving the researchers fully informed. Claiming the experiment is impossible ignores the well-established methodological protocols used across behavioral sciences. A stereotaxic procedure involves precise surgical targeting of brain structures using specialized three-dimensional coordinates.
- Subject
- Psychology
- Category
- Psychology
- Topic
- —
- Difficulty
- medium
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