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  • Placebo effect largely ignored in psychological intervention studies

    University of Illinois psychology professor Daniel Simons, left, and Florida State University professor Walter Boot report that many psychological intervention studies that claim to benefit cognition may instead be capturing differences in expectations between those who receive the intervention and those who dont.

    University of Illinois psychology professor Daniel Simons, left, and Florida State University professor Walter Boot report that many psychological intervention studies that claim to benefit cognition may instead be capturing differences in expectations between those who receive the intervention and those who don’t.

    Daniel Simons, left, and Florida State University professor Walter Boot Photo by L. Brian Stauffer

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  • Editor's note: To reach Walter Boot, call 850-645-8734; email boot@psy.fsu.edu.

    The paper, “The Pervasive Problem with Placebos in Psychology: Why Active Control Groups are Not Sufficient to Rule out Placebo Effects,” is available online.