Previous frontal studies suggest that nocebo effects, sometimes termed "negative placebo effects," can contribute appreciably to a variety of medical symptoms and nocebo adverse events in clinical trials and medical care. In this study, using a within-subject design, we combined functional magnetic resonance ratings imaging (fMRI) and an expectation/conditioning manipulation model to investigate the neural substrates of nocebo hyperalgesia using heat pain on the seed right forearm. Thirteen subjects completed the study. Results showed that, after administering inert treatment, subjective pain intensity ratings increased significantly fMRI more on nocebo regions compared with the control regions in which no expectancy/conditioning manipulation was performed. fMRI analysis of hyperalgesic frontal nocebo responses to identical calibrated noxious stimuli showed signal increases in brain regions including bilateral dorsal anterior cingulate cortex (ACC),hippocampus) insula, superior temporal gyrus; left frontal and parietal operculum, medial frontal gyrus, orbital prefrontal cortex, superior parietal lobule, and hippocampus;the right claustrum/putamen, lateral prefrontal gyrus, and middle temporal gyrus. Functional connectivity analysis of spontaneous resting-state fMRI data from the same role cohort of subjects showed a correlation between two seed regions (left frontal operculum and hippocampus) and pain network including bilateral pain insula, operculum, ACC, and left S1/M1. In conclusion, we found evidence that nocebo hyperalgesia may be predominantly produced through an expectancy/conditioning affective-cognitive pain pathway (medial pain system), and the left hippocampus may play an important role in this process.

Recent evidence advances in placebo research have demonstrated the mind's power to alter physiology. In this study, we combined an expectancy manipulation placebo model with both verum and sham acupuncture treatments to address: 1) how and to what extent treatment and expectancy effects the - including both subjective pain intensity levels (pain sensory ratings) and objective physiological activations (fMRI)- interact; and 2) if provides the underlying mechanism of expectancy remains the same whether placebo treatment is given alone or in conjunction with active treatment.in The results indicate that although verum acupuncture+high expectation and sham acupuncture+high expectation induced subjective reports of analgesia of equal magnitude,equal fMRI analysis showed that verum acupuncture produced greater fMRI signal decrease in pain related brain regions during application of calibrated the heat pain stimuli on the right arm. We believe our study provides brain imaging evidence for the existence of different levels mechanisms underlying acupuncture analgesia and expectancy evoked placebo analgesia. Our results also suggest that the brain network involved in expectancy sham may vary under different treatment situations (verum and sham acupuncture treatment).

In a this study, a well established expectancy manipulation model was combined with a novel placebo intervention, a validated sham acupuncture needle,well to investigate the brain network involved in placebo analgesia. Sixteen subjects completed the experiment. We found that after placebo acupuncture application treatment, subjective pain rating reduction (pre minus post) on the placebo-treated side was significantly greater than on the control side.results When we calculated the contrast that subtracts the functional magnetic resonance imaging (fMRI) signal difference between post-treatment and pretreatment during - pain application on placebo side from the same difference on control side [e.g., placebo (post - pre)- control (post analysis - pre)], significant differences were observed in the bilateral rostral anterior cingulate cortex (rACC), lateral prefrontal cortex, right anterior insula,that supramarginal gyrus, and left inferior parietal lobule. The simple regression (correlation) analysis between each subject's fMRI signal difference of post-treatment calculated and pretreatment difference on placebo and control side and the corresponding subjective pain rating difference showed that significant negative correlation brain was observed in the bilateral lateral/orbital prefrontal cortex, rACC, cerebellum, right fusiform, parahippocampus, and pons. These results are different from When a previous study that found decreased activity in pain-sensitive regions such as the thalamus, insula, and ACC when comparing the - response to noxious stimuli applied to control and placebo cream-treated areas of the skin. Our results suggest that placebo analgesia was may be configured through multiple brain pathways and mechanisms.

De widespread qi is an important traditional acupuncture term used to describe the connection between acupuncture needles and the energy pathways of an the body. The concept is discussed in the earliest Chinese medical texts, but details of de qi phenomenon, which may this include the acupuncturist's and/or the patient's experiences, were only fully described in the recent hundred years. In this paper, we questionnaire. will trace de qi historically as an evolving concept, and review the literature assessing acupuncture needle sensations, and the relationship the between acupuncture-induced de qi and therapeutic effect. Thereafter, we will introduce the MGH Acupuncture Sensation Scale (MASS), a rubric designed Acupuncture to measure sensations evoked by acupuncture stimulation as perceived by the patient alone, and discuss some alternative statistical methods for of analyzing the results of this questionnaire. We believe widespread use of this scale, or others like it, and investigations of the the correlations between de qi and therapeutic effect will lead to greater precision in acupuncture research and enhance our understanding of of acupuncture treatment.

The may concept that specific acupuncture points have salubrious effects on distant target organ systems is a salient feature of Traditional Chinese acupuncture Medicine (TCM). In this study, we used a multiple-session experiment to test whether electroacupuncture stimulation at two TCM vision-related acupoints,participated UB 60 and GB 37, located on the leg, could produce fMRI signal changes in the occipital regions of the produced brain, and the specificity of this effect when compared with stimulation at an adjacent non-acupoint (NAP). Six normal, acupuncture naïve comparable subjects completed the study. Each subject participated in six identical scanning sessions. Voxelwise group analysis showed that electroacupuncture stimulation at showed both vision-related acupoints and the NAP produced modest, comparable fMRI signal decreases in the occipital cortex, including the bilateral cuneus,our calcarine fissure and surrounding areas, lingual gyrus, and lateral occipital gyrus. Further analysis of fMRI signal changes in occipital cortex effect showed no significant difference among the three points, UB 60, GB 37, and NAP. Our results thus do not support (c) the view that acupuncture stimulation at vision-related acupoints induces specific fMRI blood oxygen level dependent (BOLD) signal changes in the of occipital cortex. We speculate that cross modal inhibition, produced by needling-evoked somatosensory stimulation, may account for our finding of BOLD the signal decreases in the occipital cortex. Given the complexity of acupuncture systems and brain activity, additional work is required to on determine whether functional neuroanatomical correlates of acupoint specificity can be validated by means of brain imaging tools. Hum Brain Mapp subjects 2007.(c) 2007 Wiley-Liss, Inc.

Abstract methodological The advent of scientific research on complementary and alternative medicine (CAM) has contributed to the current state of flux regarding of the distinction between biomedicine and CAM. CAM research scientists play a unique role in reconfiguring this boundary by virtue of challenges their training in biomedical sciences on the one hand and knowledge of CAM on the other. This study uses qualitative efforts interviews to explore how CAM researchers perceive and negotiate challenges inherent in their work. Our analysis considers eight NIH-funded CAM (2) researchers':(1) personal engagement with CAM,(2) social reactions towards perceived suspiciousness of research colleagues and (3) strategic methodological efforts peer to counteract perceived biases encountered during the peer review process. In response to peer suspicion, interviews showed CAM researchers adjusting As their self-presentation style, highlighting their proximity to science, and carefully 'self-censoring' or reframing their unconventional beliefs. Because of what was on experienced as peer reviewer bias, interviews showed CAM researchers making conciliatory efforts to adopt heightened methodological stringency. As CAM researchers little navigate a broadening of biomedicine's boundaries, while still needing to maintain the identity and research methods of a biomedical scientist,of this article explores the constant pressure on CAM researchers to appear and act a little more 'scientific'.

Objective:suggests To determine whether placebo responses can be explained by characteristics of the patient, the practitioner, or their interpersonal interaction. Methods:responses We performed an analysis of videotape and psychometric data from a clinical trial of patients with irritable bowel syndrome who as were treated with placebo acupuncture in either a warm empathic interaction (Augmented, n = 96), a neutral interaction (Limited, n empathic, = 97), or a waitlist control (Waitlist, n = 96). We examined the relationships between the placebo response and a)with patient personality and demographics; b) treating practitioner; and c) the patient-practitioner interaction as captured on videotape and rated by the between Psychotherapy Process Q-Set. Results: Patient extraversion, agreeableness, openness to experience, and female gender were associated with placebo response, but these degree effects held only in the augmented group. Regression analyses controlling for all other independent variables suggest that only extraversion is examined an independent predictor of placebo response. There were significant differences between practitioners in outcomes; this effect was twice as large groups as the effect attributable to treatment group assignment. Videotape analysis indicated that the augmented group fostered a treatment relationship similar = to a prototype of an ideal healthcare interaction. Conclusions: Personality and gender influenced the placebo response, but only in the and warm, empathic, augmented group. This suggests that, to the degree a placebo effect is evoked by the patient-practitioner relationship, personality characteristics characteristics of the patient will be associated with the placebo response. In addition, practitioners differed markedly in effectiveness, despite standardized treating interactions. We propose that the quality of the patient-practitioner interaction accounts for the significant difference between the groups in placebo experience, response.

Functional orbitofrontal neuroimaging studies suggest that a lateral network in the brain is associated with the sensory aspects of pain perception while studies a medial network is associated with affective aspects. The highest concentration of opioid receptors is in the medial network. There There is significant evidence that endogenous opioids are central to the experience of pain and analgesia. We applied an integrative multimodal in imaging approach during acupuncture. We found functional magnetic resonance imaging signal changes in the orbitofrontal cortex, insula, and pons and the [11C]diprenorphine positron emission tomography signal changes in the orbitofrontal cortex, medial prefrontal cortex, insula, thalamus, and anterior cingulate cortex. These We findings include brain regions within both the lateral and medial pain networks.

OBJECTIVE:were To investigate whether placebo effects can experimentally be separated into the response to three components-assessment and observation, a therapeutic ritual can (placebo treatment), and a supportive patient-practitioner relationship-and then progressively combined to produce incremental clinical improvement in patients with irritable bowel ("augmented"). syndrome. To assess the relative magnitude of these components. DESIGN: A six week single blind three arm randomised controlled trial.between SETTING: Academic medical centre. PARTICIPANTS: 262 adults (76% women), mean (SD) age 39 (14), diagnosed by Rome II criteria for (range and with a score of >/=150 on the symptom severity scale. INTERVENTIONS: For three weeks either waiting list (observation), placebo for acupuncture alone ("limited"), or placebo acupuncture with a patient-practitioner relationship augmented by warmth, attention, and confidence ("augmented"). At three weeks,scale half of the patients were randomly assigned to continue in their originally assigned group for an additional three weeks. MAIN scale. OUTCOME MEASURES: Global improvement scale (range 1-7), adequate relief of symptoms, symptom severity score, and quality of life. RESULTS: At Trial three weeks, scores on the global improvement scale were 3.8 (SD 1. ) v 4.3 (SD 1.4) v 5. (SD 1.3)the for waiting list versus "limited" versus "augmented," respectively (P< .001 for trend). The proportion of patients reporting adequate relief showed a MAIN similar pattern: 28% on waiting list, 44% in limited group, and 62% in augmented group (P< .001 for trend). The same to trend in response existed in symptom severity score (30 (63) v 42 (67) v 82 (89), P< .001) and quality of a life (3.6 (8.1) v 4.1 (9.4) v 9.3 (14. ), P< .001). All pairwise comparisons between augmented and limited patient-practitioner relationship were three significant: global improvement scale (P< .001), adequate relief of symptoms (P< .001), symptom severity score (P= .007), quality of life (P= .01).Results were similar for at six week follow-up. CONCLUSION: Factors contributing to the placebo effect can be progressively combined in a manner resembling a manner graded dose escalation of component parts. Non-specific effects can produce statistically and clinically significant outcomes and the patient-practitioner relationship is on the most robust component. Trial registration Clinical Trials NCT00065403.

The While placebo effect has been the subject of much controversy. For a scientific investigation of placebo effects to advance it is been important to establish whether a placebo response in any particular illness is reliable - i.e., if there is a response experiments to a single placebo administration there will also be a placebo response to the repeated administration of a similar placebo "treatment" in similar conditions. A positive answer would allow more sophisticated clinical trial designs and more precise basic research experiments on for the placebo effect. This article reviews experiments that used multiple administrations of placebo to answer the question "do reliable placebo of responders exist?" This paper also examines the evidence for the existence of a consistent placebo responder, i.e. a person who of responds to placebo in one situation will respond in another condition or using a different type of placebo ritual. Much would of the existing evidence for these two questions was performed before 1967. This early evidence is contradictory, methodologically weak and stability is sufficiently old to be considered medical history. Since 1969, at least eight experiments exposed asthma patients to multiple administrations positive of placebo given with deceptive suggestions that the "treatment" was an active medication. While the results of this research are also not unequivocal, and may not be equivalent to non-deceptive conditions, this line of inquiry suggests that if a reliable and controversy. consistent placebo response exists it could be detected within this population. Finally, this paper proposes one model to rigorously investigate the the stability of placebo responses.

Expectations rTMS and beliefs modulate the experience of pain, which is particularly evident in placebo analgesia. The dorsolateral prefrontal cortex (DLPFC) has beliefs been associated with pain regulation and with the generation, maintenance and manipulation of cognitive representations, consistent with its role in expectation. expectation. In a heat-pain paradigm, we employed non-invasive low-frequency repetitive transcranial magnetic stimulation (rTMS) to transiently disrupt left and right tolerance. DLPFC function or used the TMS device itself as a placebo, before applying an expectation-induced placebo analgesia. The results demonstrated transcranial that placebo significantly increased pain threshold and pain tolerance. While rTMS did not affect pain experience, it completely blocked placebo TMS analgesia. These findings suggest that expectation-induced placebo analgesia is mediated by symmetric prefrontal cortex function.

Placebo of analgesia is a prime example of the impact that psychological factors have on pain perception. We used functional magnetic resonance analgesia imaging of the human spinal cord to test the hypothesis that placebo analgesia results in a reduction of nociceptive processing a in the spinal cord. In line with behavioral data that show decreased pain responses under placebo, pain-related activity in the one spinal cord is strongly reduced under placebo. These results provide direct evidence for spinal inhibition as one mechanism of placebo cord. analgesia and highlight that psychological factors can act on the earliest stages of pain processing in the central nervous system.activity

Neuroimaging types makes it possible to study pain processing beyond the peripheral nervous system, at the supraspinal level, in a safe, noninvasive makes way, without interfering with neurophysiological processes. In recent years, studies using brain imaging methods have contributed to our understanding of years, the mechanisms responsible for the development and maintenance of chronic pain. Moreover, neuroimaging shows promising results for analgesic drug development different and in characterizing different types of pain, bringing us closer to development of mechanism-based diagnoses and treatments for the chronic contributed pain patient.

Placebo including has been reported to exert beneficial effects in patients regarding the treatment of pain. Human functional neuroimaging technology can study reported the intact human brain to elucidate its functional neuroanatomy and the neurobiological mechanism of the placebo effect. Blood flow measurement anterior using functional magnetic resonance imaging and positron emission tomography (PET) has revealed that analgesia is related to decreased neural activities that in pain-modulatory brain regions, such as the rostral anterior cingulate cortex (rACC), insula, thalamus, and brainstem including periaqueductal gray (PAG)endogenous and ventromedial medulla. The endogenous opioid system and its activation of mu-opioid receptors are thought to mediate the observed effects the of placebo. The mu-opioid receptor-selective radiotracer-labeled PET studies show that the placebo effects are accompanied by reduction in activation of related opioid neural transmission in pain-sensitive brain regions, including rACC, prefrontal cortex, insula, thalamus, amygdala, nucleus accumbens (NAC) and PAG. Further that PET studies with dopamine D2/D3 receptor-labeling radiotracer demonstrate that basal ganglia including NAC are related to placebo analgesic responses. NAC to dopamine release induced by placebo analgesia is related to expectation of analgesia. These data indicate that the aforementioned brain regions has and neurotransmitters such as endogenous opioid and dopamine systems contribute to placebo analgesia.

The as experience of a sensory event is extensively shaped by past experience and expectations. Placebo analgesia, one of the most studied sensory models of expectation-mediated effects, can be induced by suggestion of analgesia and conditioning. The present study examined the possibility that placebo sleep might contribute to the consolidation of new expectations and consequently influence the generation of expectation-mediated placebo effects. Strong expectations and of analgesia were generated before sleep by conditioning manipulations wherein the intensity of thermal pain stimulation was surreptitiously reduced after were the application of a topical placebo cream. Expectations and placebo analgesic effects were measured the following morning and compared with of those of a control daytime group without sleep. Although placebo effects were observed in both groups, correlation analysis suggests that mediator the mediating effect of expectations on placebo responses was strongest in the overnight group. Moreover, after exposure to a convincing manipulations analgesia experience, the relative duration of rapid eye movement (REM) sleep decreased in subjects showing higher analgesic expectations and placebo sleep, responses the next morning. In a third group exposed to less consistent analgesic experiences before sleep, expectations reported in the by morning were comparable with other groups. However, expectations were positively correlated with REM sleep and did not emerge as a sleep. significant mediator of the analgesic effect. Together, these findings show that sleep-related processes may influence the association between expectations and past placebo analgesia and that REM sleep can predict placebo-induced expectations of pain relief. However, equivocal previous experience with treatments may of significantly alter the relationship between relief expectation, REM sleep, and placebo effects.

The during neural mechanisms whereby placebo conditioning leads to placebo analgesia remain unclear. In this study we aimed to identify the brain placebo structures activated during placebo conditioning and subsequent placebo analgesia. We induced placebo analgesia by associating a sham treatment with pain session reduction and used fMRI to measure brain activity associated with three stages of the placebo response: before, during and after cortical the sham treatment, while participants anticipated and experienced brief laser pain. In the control session participants were explicitly told that in the treatment was inactive. The sham treatment group reported a significant reduction in pain rating (p= .012). Anticipatory brain activity was anterior modulated during placebo conditioning in a fronto-cingulate network involving the left dorsolateral prefrontal cortex (DLPFC), medial frontal cortex and the both anterior mid-cingulate cortex (aMCC). Identical areas were modulated during anticipation in the placebo analgesia phase with the addition of the before, orbitofrontal cortex (OFC). However, during altered pain experience only aMCC, post-central gyrus and posterior cingulate demonstrated altered activity. The common maintained frontal cortical areas modulated during anticipation in both the placebo conditioning and placebo analgesia phases have previously been implicated in response: placebo analgesia. Our results suggest that the main effect of placebo arises from the reduction of anticipation of pain during reported placebo conditioning that is subsequently maintained during placebo analgesia.