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Open research questions in Pain Management and Placebo Effect

51 unresolved questions extracted from the limitations and future-work sections of 844 Pain Management and Placebo Effect papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • A strength of this review is the integration of laboratory-based expectancy paradigms with clinically embedded studies across multiple long-term conditions. Detailed extraction of statistical approaches and moderator analyses enhances transparency regarding evidential strength. The inclusion of both subjective and physiological outcomes allows consideration of mechanistic breadth. Limitations include heterogeneity of design and outcome measurement, inconsistent reporting of standardised effect sizes, and generally modest sample sizes. The absence of meta-analysis limits quantitative precision. Additionally, many studies examined shortterm or experimentally induced outcomes rather than long-term disease trajectories, constraining inference regarding sustained clinical impact. Methodologically, several features constrain interpretation. Standardised effect sizes were infrequently reported, despite statistically significant findings in multiple studies, with most analyses relying on p-values, F statistics, or regression coefficients without accompanying standardised indices (24–26, 30–32, 35). This limits cross-study comparison and precludes quantitative synthesis. Sample sizes were often modest, particularly in laboratory-based paradigms, increasing vulnerability to both Type I and Type II error. Designs varied considerably, including analogue online studies, laboratory induction paradigms, and clinical trials embedded within treatment contexts. While this enhances ecological breadth, it reduces methodological uniformity. The search strategy was intentionally anchored to the conceptual construct of the nocebo effect rather than to a broad array of loosely related expectancy terms. This approach prioritised conceptual specificity and theoretical coherence.

    Nocebo effects in long-term health conditions: a systematic review of experimental studies · 2026 · DOI

  • There is insufficient recognition and consistent application of standards that account for non-specific effects in neurofeedback research, despite such effects being accepted and expected in established treatments like CBT and pharmacotherapy.

    Rethinking control conditions in clinical neurofeedback trials · 2026 · DOI

  • While the etiology of ‘genito-pelvic pain and penetration disorder’ (GPP/PD) is inconclusive, applying knowledge from trauma-informed practices and mindfulness techniques may offer clients relief where traditional top down, physical therapy or medical interventions fall short.

    Tending to painful sex: applying the neuroscience of trauma and anxiety using mindfulness and somatic embodiment in working with genito-pelvic pain and penetration disorders · 2021 · DOI

  • Despite the limitations of this study, the results suggest that NFB is better than placebo in improving impulsivity and clinical symptoms of anxiety and depression in long-term abstinent cocaine- and heroin-dependent individuals.

    Benefits of EEG-Neurofeedback on the Modulation of Impulsivity in a Sample of Cocaine and Heroin Long-Term Abstinent Inmates: A Pilot Study · 2020 · DOI

  • Recent results using mindfulness for cold pressor pain found a mixed results, with one reporting a 12 minute mindfulness task not sufficient to increase tolerance time (Sharpe et al, 2009) and one using a 15 minute mindfulness task finding it was sufficient to increase pain tolerance (Liu et al, 2013).

    A comparison of therapist-present or therapist-free delivery of very brief mindfulness and hypnosis for acute experimental pain · 2014

  • The paper notes that determining whether drugs like Prozac derive effectiveness from pharmacological mechanism versus placebo effect requires clarification of placebo boundaries, but no methodological framework exists for disambiguating these mechanisms. Research must develop validated measurement techniques to isolate pharmacological effects from emotion-mediated placebo effects in antidepressant trials.

    A Critique of Evidence-Based Medicine (EBM): Evidence-Based Medicine and Philosophy-Based Medicine · 2011 · DOI

  • The paper identifies that the relationship between negative psychological assessment and physiological counteraction of desired treatment effects lacks systematic investigation in EBM trials. Studies must measure patient psychological assessments and corresponding physiological markers alongside placebo control conditions to quantify how negative cognitions alter treatment efficacy.

    A Critique of Evidence-Based Medicine (EBM): Evidence-Based Medicine and Philosophy-Based Medicine · 2011 · DOI

  • The paper raises unresolved ethical and practical questions about whether informed consent protocols that disclose placebo possibility versus non-disclosure versus uncertainty about placebo status produce differential emotional responses and treatment outcomes. Research must empirically compare patient emotional states, apprehension levels, and clinical outcomes across these three informed consent disclosure conditions in placebo-controlled trials.

    A Critique of Evidence-Based Medicine (EBM): Evidence-Based Medicine and Philosophy-Based Medicine · 2011 · DOI

  • The paper notes that antidepressant efficacy claims lack clarity regarding what 'improvement' and 'work' mean in FDA approval processes, and that the Hróbjartsson and Gøtzsche meta-analysis found placebo effects differ substantially across 40 different clinical conditions. Future work must establish standardized outcome measures for improvement and define condition-specific improvement criteria for antidepressants, anxiety, smoking cessation, obesity, and pain treatment separately.

    A Critique of Evidence-Based Medicine (EBM): Evidence-Based Medicine and Philosophy-Based Medicine · 2011 · DOI

  • The paper identifies that placebo definitions in EBM trials remain inadequately specified, preventing determination of which particular cognitions, beliefs, or emotional states constitute the placebo mechanism in any given clinical trial. Future research must operationalize and specify the exact cognitive and emotional components that should be measured and controlled in placebo-controlled trials across different clinical conditions.

    A Critique of Evidence-Based Medicine (EBM): Evidence-Based Medicine and Philosophy-Based Medicine · 2011 · DOI

  • The conclusion is that although a definitive EEG-based signature for hypnosis and hypnotizability is not yet established, there are a number of promising leads.

    Psychophysiological correlates of hypnosis and hypnotic susceptibility · 1999 · DOI

  • Accordingly, future experimental work should take into account this multidimensionality; phenomenological, situational, cognitive, and motivational factors implicated in verbal reports should be explored in terms of their respective relationships with both hypnotizability and self-ratings of hypnotic depth.

    Reports of Hypnotic Depth: Are they More than Mere Words? · 1986 · DOI

  • While the findings are in general accord with those of Tart (1970, 1972), further research is required in order to determine the underlying basis of depth reports, and the degree to which experimental reports of susceptibility and clinical reports of depth reflect similar experiential aspects of hypnosis.

    Hypnotic depth and hypnotic susceptibility: A replicated finding · 1980 · DOI

  • Whether it can also have a positive effect on healing rate in other Downloaded by [University of Cambridge] at 18:48 13 October 2014 158 CRBSILNECK AND HALL areas remains an open question, although in the cases presented here we would not wish to suggest any effect other than increased motivation for recovery.

    The use of hypnosis in the rehabilitation of complicate vascular and post-traumatic neurological patients · 1970 · DOI

  • The range of applicability of this training technique for individuals of varied initial hypnotic susceptibility or for modification of hyp- notic tasks of varied difficulty could not be determined from the present research design. The results for gains in performance are there- fore somewhat limited by the use of SHSS:A and SHSS:C.

    Modification of hypnotic susceptibility · 1967 · DOI

  • Because of the approximately equal scores for the two types of source amnesia obtained by Group 11, a correlation analysis of the data for this group is warranted.

    Spontaneous and suggested posthypnotic source amnesia · 1966 · DOI

  • With some Ss the decreased awareness or limited generalized reality context (Shor, 1959) of the hypnotic state produces a dissocia- tion of events as they occur, since the context in which the events of hypnosis are occurring is limited to the nature, occurrence, and dura- tion of the actual event.

    Two types of posthypnotic amnesia: Recall amnesia and source amnesia · 1966 · DOI

  • In any event, further research is necessary before any definite conclu- sions can be drawn concerning the nature of these psychological in- fluences and the extent to which they participate in and contribute to these clinical conditions. Downloaded by [University of Strathclyde] at 10:02 22 January 2015 EXPERIMENTALLY PRODUCED DRUG EFFECTS 17 (Himmelsbach, 1941), these exploratory physiological findings would seem to warrant further investigation and c o n h a t i o n .

    The Experimental Production of Narcotic Drug Effects and Withdrawal Symptoms Through Hypnosis · 1964 · DOI

  • Downloaded by [Deakin University Library] at 10:45 06 November 2015 HIGHWAY HYPNOSIS: AN HYPOTHESls 151 Distraction within prescribed limits seems, within our present limited knowledge, the best way to avoid highway hypnosis.

    Highway Hypnosis: An Hypothesis · 1963 · DOI

  • Many of the contradictory reports can be explained by recognition of hypnosis as a psychodynamic relationship rather than a quantitatable “state. Since this is scarcely feasible, we would a t least suggest that each report of experimentation contain, as a matter of course, the outcome Downloaded by [Memorial University of Newfoundland] at 18:55 29 January 2015 40 HAROLD B.

    Physiological changes associated with hypnosis: A review of the literature since 1948 · 1959 · DOI

  • The weight of th~ evidence indicates that a quantitative influence on vasomotor and allied phenomena is possible by means of hypnosis in suitable sub- jects; the extent of this influence and the factors which enter into it are not well understood and, like so many aspects of hypnosis~ will have to be elucidated by future investigations.

    The physiology of hypnosis. I · 1949 · DOI

  • Neurofeedback is subject to disproportionately stringent interpretive standards compared to psychotherapy and pharmacotherapy despite all three domains showing comparable proportions of non-specific effects and variable effect sizes across disorders.

    Rethinking control conditions in clinical neurofeedback trials · 2026 · DOI

  • The field must develop appropriate control condition designs that do not function as active placebos (which confound interpretation by retaining mechanistically meaningful components) rather than continuing to use sham neurofeedback conditions.

    Rethinking control conditions in clinical neurofeedback trials · 2026 · DOI

  • The field lacks experimental models that appropriately reflect the true nature of neurofeedback as an intervention based on feedback, engagement, and learning rather than inert mechanisms.

    Rethinking control conditions in clinical neurofeedback trials · 2026 · DOI

  • A refinement of clinical research methodology is needed, as well as greater appreciation of contextual complexity for all interventions targeting mental health, rather than simply conducting more RCTs following the same flawed approach.

    Rethinking control conditions in clinical neurofeedback trials · 2026 · DOI

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51 open questions have been extracted from the limitations and future-work passages of 844 Pain Management and Placebo Effect papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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