Placebo-Induced Somatic Sensations: A Multi-Modal Study of Three Different Placebo Interventions
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{"title"=>"Placebo-induced somatic sensations: A multi-modal study of three different placebo interventions", "type"=>"journal", "authors"=>[{"first_name"=>"Florian", "last_name"=>"Beissner", "scopus_author_id"=>"25638376200"}, {"first_name"=>"Franziska", "last_name"=>"Brünner", "scopus_author_id"=>"56684429700"}, {"first_name"=>"Maria", "last_name"=>"Fink", "scopus_author_id"=>"56673536200"}, {"first_name"=>"Karin", "last_name"=>"Meissner", "scopus_author_id"=>"56262864500"}, {"first_name"=>"Ted J.", "last_name"=>"Kaptchuk", "scopus_author_id"=>"26643513100"}, {"first_name"=>"Vitaly", "last_name"=>"Napadow", "scopus_author_id"=>"6602462464"}], "year"=>2015, "source"=>"PLoS ONE", "identifiers"=>{"pmid"=>"25901350", "issn"=>"19326203", "doi"=>"10.1371/journal.pone.0124808", "pui"=>"604612213", "scopus"=>"2-s2.0-84930676584", "sgr"=>"84930676584"}, "id"=>"b32b927c-95d2-3f87-8e5a-5c868c6a3c9d", "abstract"=>"Somatic sensations induced by placebos are a frequent phenomenon whose etiology and clinical relevance remains unknown. In this study, we have evaluated the quantitative, qualitative, spatial, and temporal characteristics of placebo-induced somatic sensations in response to three different placebo interventions: (1) placebo irritant solution, (2) placebo laser stimulation, and (3) imagined laser stimulation. The quality and intensity of evoked sensations were assessed using the McGill pain questionnaire and visual analogue scales (VAS), while subjects' sensation drawings processed by a geographic information system (GIS) were used to measure their spatial characteristics. We found that all three interventions are capable of producing robust sensations most frequently described as \"tingling\" and \"warm\" that can reach consider-able spatial extent (≤ 205 mm²) and intensity (≤ 80/100 VAS). Sensations from placebo stimulation were often referred to areas remote from the stimulation site and exhibit considerable similarity with referred pain. Interestingly, there was considerable similarity of qualitative features as well as spatial patterns across subjects and placebos. However, placebo laser stimulation elicited significantly stronger and more widespread sensations than placebo irritant solution. Finally, novelty seeking, a character trait assessed by the Temperament and Character Inventory and associated with basal dopaminergic activity, was less pronounced in subjects susceptible to report placebo-induced sensations. Our study has shown that placebo-induced sensations are frequent and can reach considerable intensity and extent. As multiple somatosensory subsystems are involved despite the lack of peripheral stimulus, we propose a central etiology for this phenomenon.", "link"=>"http://www.mendeley.com/research/placeboinduced-somatic-sensations-multimodal-study-three-different-placebo-interventions", "reader_count"=>29, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Researcher"=>6, "Student > Doctoral Student"=>3, "Student > Ph. D. Student"=>1, "Other"=>3, "Student > Master"=>6, "Student > Bachelor"=>3, "Lecturer"=>2, "Lecturer > Senior Lecturer"=>1, "Professor"=>3}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Researcher"=>6, "Student > Doctoral Student"=>3, "Student > Ph. D. Student"=>1, "Other"=>3, "Student > Master"=>6, "Student > Bachelor"=>3, "Lecturer"=>2, "Lecturer > Senior Lecturer"=>1, "Professor"=>3}, "reader_count_by_subject_area"=>{"Unspecified"=>3, "Engineering"=>2, "Nursing and Health Professions"=>1, "Medicine and Dentistry"=>7, "Agricultural and Biological Sciences"=>2, "Neuroscience"=>4, "Pharmacology, Toxicology and Pharmaceutical Science"=>1, "Psychology"=>9}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>2}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>7}, "Neuroscience"=>{"Neuroscience"=>4}, "Psychology"=>{"Psychology"=>9}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>2}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>1}, "Unspecified"=>{"Unspecified"=>3}, "Pharmacology, Toxicology and Pharmaceutical Science"=>{"Pharmacology, Toxicology and Pharmaceutical Science"=>1}}, "reader_count_by_country"=>{"United States"=>1, "United Kingdom"=>1}, "group_count"=>0}

Scopus | Further Information

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/2035173", "https://ndownloader.figshare.com/files/2035174", "https://ndownloader.figshare.com/files/2035175", "https://ndownloader.figshare.com/files/2035176", "https://ndownloader.figshare.com/files/2035177", "https://ndownloader.figshare.com/files/2035178"], "description"=>"<div><p>Somatic sensations induced by placebos are a frequent phenomenon whose etiology and clinical relevance remains unknown. In this study, we have evaluated the quantitative, qualitative, spatial, and temporal characteristics of placebo-induced somatic sensations in response to three different placebo interventions: (1) placebo irritant solution, (2) placebo laser stimulation, and (3) imagined laser stimulation. The quality and intensity of evoked sensations were assessed using the McGill pain questionnaire and visual analogue scales (VAS), while subjects’ sensation drawings processed by a geographic information system (GIS) were used to measure their spatial characteristics. We found that all three interventions are capable of producing robust sensations most frequently described as “tingling” and “warm” that can reach consider-able spatial extent (≤ 205mm<sup>²</sup>) and intensity (≤ 80/100 VAS). Sensations from placebo stimulation were often referred to areas remote from the stimulation site and exhibit considerable similarity with referred pain. Interestingly, there was considerable similarity of qualitative features as well as spatial patterns across subjects and placebos. However, placebo laser stimulation elicited significantly stronger and more widespread sensations than placebo irritant solution. Finally, novelty seeking, a character trait assessed by the Temperament and Character Inventory and associated with basal dopaminergic activity, was less pronounced in subjects susceptible to report placebo-induced sensations. Our study has shown that placebo-induced sensations are frequent and can reach considerable intensity and extent. As multiple somatosensory subsystems are involved despite the lack of peripheral stimulus, we propose a central etiology for this phenomenon.</p></div>", "links"=>[], "tags"=>["Character Inventory", "gis", "vas", "placebo stimulation", "intensity", "placebo interventions", "subject", "basal dopaminergic activity", "character trait", "placebo irritant solution", "analogue scales", "placebo laser stimulation", "laser stimulation", "McGill pain questionnaire", "Different Placebo Interventions Somatic sensations", "somatosensory subsystems", "information system", "stimulation site"], "article_id"=>1390921, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Florian Beissner", "Franziska Brünner", "Maria Fink", "Karin Meissner", "Ted J. Kaptchuk", "Vitaly Napadow"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0124808.s001", "https://dx.doi.org/10.1371/journal.pone.0124808.s002", "https://dx.doi.org/10.1371/journal.pone.0124808.s003", "https://dx.doi.org/10.1371/journal.pone.0124808.s004", "https://dx.doi.org/10.1371/journal.pone.0124808.s005", "https://dx.doi.org/10.1371/journal.pone.0124808.s006"], "stats"=>{"downloads"=>8, "page_views"=>21, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Placebo_Induced_Somatic_Sensations_A_Multi_Modal_Study_of_Three_Different_Placebo_Interventions_/1390921", "title"=>"Placebo-Induced Somatic Sensations: A Multi-Modal Study of Three Different Placebo Interventions", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2015-04-22 02:59:50"}
  • {"files"=>["https://ndownloader.figshare.com/files/2035142"], "description"=>"<p>a) Locations stimulated in the experiment. b) Placebos used in the study. Left side: Placebo irritant solution (water), right side: Placebo laser (switched off). c) Application of the two placebos to the little finger of the hand.</p>", "links"=>[], "tags"=>["Character Inventory", "gis", "vas", "placebo stimulation", "intensity", "placebo interventions", "subject", "basal dopaminergic activity", "character trait", "placebo irritant solution", "analogue scales", "placebo laser stimulation", "laser stimulation", "McGill pain questionnaire", "Different Placebo Interventions Somatic sensations", "somatosensory subsystems", "information system", "stimulation site"], "article_id"=>1390890, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Florian Beissner", "Franziska Brünner", "Maria Fink", "Karin Meissner", "Ted J. Kaptchuk", "Vitaly Napadow"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0124808.g001", "stats"=>{"downloads"=>2, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Stimulation_loci_and_placebo_interventions_/1390890", "title"=>"Stimulation loci and placebo interventions.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-04-22 02:59:50"}
  • {"files"=>["https://ndownloader.figshare.com/files/2035145"], "description"=>"<p>Sensations elicited by placebo irritant solution (left) and placebo laser (right). The stimulation site is marked with an arrowhead. Only areas that were reported by two or more subjects are shown. Note the referral of sensations to areas remote from the stimulation site as well as to the contralateral side of the body.</p>", "links"=>[], "tags"=>["Character Inventory", "gis", "vas", "placebo stimulation", "intensity", "placebo interventions", "subject", "basal dopaminergic activity", "character trait", "placebo irritant solution", "analogue scales", "placebo laser stimulation", "laser stimulation", "McGill pain questionnaire", "Different Placebo Interventions Somatic sensations", "somatosensory subsystems", "information system", "stimulation site"], "article_id"=>1390893, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Florian Beissner", "Franziska Brünner", "Maria Fink", "Karin Meissner", "Ted J. Kaptchuk", "Vitaly Napadow"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0124808.g002", "stats"=>{"downloads"=>4, "page_views"=>24, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Spatial_patterns_of_placebo_induced_sensations_/1390893", "title"=>"Spatial patterns of placebo-induced sensations.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-04-22 02:59:50"}
  • {"files"=>["https://ndownloader.figshare.com/files/2035150"], "description"=>"<p>The color in each point represents the number of subjects that imagined having sensations in that location. Only areas that were reported by two or more subjects are shown. The site of (imagined) stimulation is marked with an arrowhead. The upper image shows the results from subjects that actually experienced sensations during imagination, the lower of those who did not. Note the remarkable amount of overlap of sensations in both groups as well as the divergence of lines into an ulnar and a median line at the wrist.</p>", "links"=>[], "tags"=>["Character Inventory", "gis", "vas", "placebo stimulation", "intensity", "placebo interventions", "subject", "basal dopaminergic activity", "character trait", "placebo irritant solution", "analogue scales", "placebo laser stimulation", "laser stimulation", "McGill pain questionnaire", "Different Placebo Interventions Somatic sensations", "somatosensory subsystems", "information system", "stimulation site"], "article_id"=>1390898, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Florian Beissner", "Franziska Brünner", "Maria Fink", "Karin Meissner", "Ted J. Kaptchuk", "Vitaly Napadow"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0124808.g003", "stats"=>{"downloads"=>2, "page_views"=>18, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Spatial_patterns_of_placebo_induced_sensations_as_imagined_by_subjects_to_result_from_laser_stimulation_/1390898", "title"=>"Spatial patterns of placebo-induced sensations as imagined by subjects to result from laser stimulation.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-04-22 02:59:50"}
  • {"files"=>["https://ndownloader.figshare.com/files/2035153"], "description"=>"<p>Spatial comparison showing similarities of placebo-induced and imagination-induced sensation patterns (center) with patterns from low-level laser stimulation (left) and referred pain induced by hypertonic saline injection into paravertebral muscles (right) as reported in [<a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0124808#pone.0124808.ref031\" target=\"_blank\">31</a>].</p>", "links"=>[], "tags"=>["Character Inventory", "gis", "vas", "placebo stimulation", "intensity", "placebo interventions", "subject", "basal dopaminergic activity", "character trait", "placebo irritant solution", "analogue scales", "placebo laser stimulation", "laser stimulation", "McGill pain questionnaire", "Different Placebo Interventions Somatic sensations", "somatosensory subsystems", "information system", "stimulation site"], "article_id"=>1390901, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Florian Beissner", "Franziska Brünner", "Maria Fink", "Karin Meissner", "Ted J. Kaptchuk", "Vitaly Napadow"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0124808.g004", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Similarities_of_placebo_induced_sensations_and_referred_pain_/1390901", "title"=>"Similarities of placebo-induced sensations and referred pain.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-04-22 02:59:50"}
  • {"files"=>["https://ndownloader.figshare.com/files/2035156"], "description"=>"<p>Incidence of the nine most common verbal descriptors for placebo-induced sensations. Of all 78 possible descriptors, these were the only ones chosen by 20% or more of the subjects. Together, they accounted for 59.9% of all reported sensations, which illustrates the similarity of sensations across subjects. Results from the imagined stimulation (experiment 3) are shown in the small box. In addition to the two most common descriptors from experiments 1 and 2, subjects frequently reported radiating sensations for imagined stimulation.</p>", "links"=>[], "tags"=>["Character Inventory", "gis", "vas", "placebo stimulation", "intensity", "placebo interventions", "subject", "basal dopaminergic activity", "character trait", "placebo irritant solution", "analogue scales", "placebo laser stimulation", "laser stimulation", "McGill pain questionnaire", "Different Placebo Interventions Somatic sensations", "somatosensory subsystems", "information system", "stimulation site"], "article_id"=>1390904, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Florian Beissner", "Franziska Brünner", "Maria Fink", "Karin Meissner", "Ted J. Kaptchuk", "Vitaly Napadow"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0124808.g005", "stats"=>{"downloads"=>2, "page_views"=>15, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Verbal_descriptors_for_sensations_/1390904", "title"=>"Verbal descriptors for sensations.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-04-22 02:59:50"}
  • {"files"=>["https://ndownloader.figshare.com/files/2035157"], "description"=>"<p>Histograms of placebo-induced sensation onset time (defined as the time between the announced placebo stimulation and the onset of the first sensation reported by the subject). Median values were 38s for placebo irritant solution and 42.5s for placebo laser. No difference between distributions was found.</p>", "links"=>[], "tags"=>["Character Inventory", "gis", "vas", "placebo stimulation", "intensity", "placebo interventions", "subject", "basal dopaminergic activity", "character trait", "placebo irritant solution", "analogue scales", "placebo laser stimulation", "laser stimulation", "McGill pain questionnaire", "Different Placebo Interventions Somatic sensations", "somatosensory subsystems", "information system", "stimulation site"], "article_id"=>1390905, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Florian Beissner", "Franziska Brünner", "Maria Fink", "Karin Meissner", "Ted J. Kaptchuk", "Vitaly Napadow"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0124808.g006", "stats"=>{"downloads"=>4, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Onset_of_sensations_/1390905", "title"=>"Onset of sensations.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-04-22 02:59:50"}
  • {"files"=>["https://ndownloader.figshare.com/files/2035159"], "description"=>"<p>Results from a comparison of character traits in subjects with and without placebo-induced sensation during imagined stimulation (experiment 3). Susceptible subjects showed a significantly lower TCI score in the “novelty seeking” category (p = 0.0071) pointing to higher basal dopaminergic activity in these subjects [<a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0124808#pone.0124808.ref024\" target=\"_blank\">24</a>].</p>", "links"=>[], "tags"=>["Character Inventory", "gis", "vas", "placebo stimulation", "intensity", "placebo interventions", "subject", "basal dopaminergic activity", "character trait", "placebo irritant solution", "analogue scales", "placebo laser stimulation", "laser stimulation", "McGill pain questionnaire", "Different Placebo Interventions Somatic sensations", "somatosensory subsystems", "information system", "stimulation site"], "article_id"=>1390907, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Florian Beissner", "Franziska Brünner", "Maria Fink", "Karin Meissner", "Ted J. Kaptchuk", "Vitaly Napadow"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0124808.g007", "stats"=>{"downloads"=>6, "page_views"=>23, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Differences_in_character_traits_of_susceptible_and_non_susceptible_subjects_/1390907", "title"=>"Differences in character traits of susceptible and non-susceptible subjects.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-04-22 02:59:50"}

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{"start_date"=>"2015-01-01T00:00:00Z", "end_date"=>"2015-12-31T00:00:00Z", "subject_areas"=>[]}
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