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Scoping Review of Mindfulness Research: a Topic Modelling Approach

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Abstract

Objectives

As the volume of mindfulness research continues amassing exponentially, there have been attempts to review works in various aspects of mindfulness research systematically. The present study provides a scoping review via a topic modelling approach to supplement the overall research synthesis effort. Specifically, the objective is to scope the mindfulness research by identifying topics relevant to mindfulness research using the probabilistic topic modelling approach.

Methods

A literature search based on “mindfulness” returned 5947 bibliographical records from the Web of Science Core Collection platform (for records up to 20 October 2017). The combined field of titles and abstracts was subjected to probabilistic topic modelling based on latent Dirichlet allocation (LDA).

Results

The optimal number of topics suggested was 106. Further interpretation by the research team resulted in a total of 231 Suggested Terms. The terms were further categorised into Condition/Issue, Construct/Philosophy, Modality, Population/Setting and Research Methodology.

Conclusions

The topic modelling process obtained a panoptic view of mindfulness research, providing mindfulness researchers with some indicators regarding the range of topics researched. The outcome of this topic modelling effort has been made available at https://hdl.handle.net/10497/20862.

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Acknowledgements

We like to thank Clarivate Analytics for Web of Science Core Collection data access. We would also like to thank research assistants for their help with preparing the reference lists for identified topics.

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Authors and Affiliations

Authors

Contributions

YHK conceptualised the study, completed the data analysis involving R programming, led the interpretation of Collective Themes and Suggested Terms, wrote the paper and formatted the TiddlyWiki file. CL wrote part of the methods and discussion sections, interpreted the Collective Themes and Suggested Terms and formatted the TiddlyWiki file. LCK wrote part of the discussion section, interpreted the Collective Themes and Suggested Terms and formatted the TiddlyWiki file. CJT wrote part of the introduction section and interpreted the Collective Themes and Suggested Terms. KC analysed the data and prepared the figures depicting the beta cutoff. All authors approved the final version of the manuscript for submission.

Corresponding author

Correspondence to Chunxiao Li.

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Conflicting of Interest

The authors declare that there is no conflict of interest.

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Appendices

Appendix 1

Additional Technical Details of Topic Modelling

To determine the optimal number of topics within the document term matrix, the optimal_k function (available on https://github.com/trinker) was used. This function produces multiple LDA models iteratively (parameters: seed = 5412, burnin = 1000, thin = 100, iter = 1000, keep = 100) and plots the harmonic means of the log likelihoods from each topic. We set an upper limit of 200 topics and ran the simulations. The entire process took approximately 11 h on a laptop with the following configuration: Windows 7 Enterprise Intel® Core i7-4510 U CPU at 2 GHz, 2.6 GHz with 8 GB RAM and 64-bit operating system. Since the value depicting the maximisation of the harmonic mean of the log-likelihood was 106, we set the optimal number of topics as 106.

Once the optimal number of topics was determined, we generated the final LDA model on the document term matrix using the lda function in topicmodels (Grün and Hornik 2011) based on k = 106 and the aforementioned parameters. Within the final model of 106 topics, each topic was assigned an arbitrary topic number (e.g. Topic 1), and with each topic, a list of generated terms together with the terms’ respective beta values were derived. Briefly, beta is indicative of the probability of occurrence of a term within a topic, or per-topic-per-word probabilities (Silge and Robinson 2017). For example, if a generated term “sport” has a beta of 0.30 for Topic N, it means that the probability of “sport” being generated from Topic N is 30%. Within a topic, say sport, one may find that a closely related word for that topic, for example, “athletics,” may have a higher beta then a relatively unrelated word like “headsets.” Since all the generated terms are assigned to each topic but with varying betas, to derive a meaningful list of terms for each topic, we calculated a cutoff value for beta to omit terms with substantially lower betas, using the Fisher method, implemented with the classIntervals function in classInt (Bivand 2017). A list of more relevant generated terms for each topic which are surfaced for subsequent interpretation as a result (e.g. flow, coach, athlete and sport), after dropping the remaining terms with betas lower than the cutoff value (e.g. neighbourhood and fund). In some cases, there is only one term as the beta values for the second term onwards are below the cutoff value.

We further rely on the gamma values to generate lists of publications that best represent contents tied to each topic number. Briefly, the gamma value is an estimation of the proportion of words from a particular publication record that is generated from a specified topic, or per-document-per-topic probabilities (Silge and Robinson 2017). For example, if record A has a gamma of 0.90 for Topic X whilst record B has a gamma of 0.01 for Topic X, Topic X is better represented by record A than record B, comparatively. The result is that all the records will have a gamma value for a target topic. With that, a cutoff value, derived using the aforementioned Fisher method, was applied to derive the list of records with substantially greater gammas to further interpret the topic.

Appendix 2

Collective Themes

Topic 1: Youth

Topic 2: Unclear

Topic 3: Intolerance

Topic 4: Mind-wandering

Topic 5: Sport performance

Topic 6: Pregnancy

Topic 7: Unclear

Topic 8: Contemplative science

Topic 9: Implicit processes

Topic 10: Caregiving

Topic 11: Ethics

Topic 12: Electroencephalogram (EEG)

Topic 13: Decentering

Topic 14: Mind-body relation

Topic 15: Bipolar disorder

Topic 16: Inflammation

Topic 17: Unclear

Topic 18: Unclear

Topic 19: Therapy

Topic 20: Spirituality

Topic 21: Unclear

Topic 22: Yoga

Topic 23: Mobile phone

Topic 24: Mindful Attention Awareness Scale (MAAS)

Topic 25: Teams and organisations

Topic 26: Unclear

Topic 27: Substance use

Topic 28: Nursing

Topic 29: Creativity in mind-wandering

Topic 30: Sleep

Topic 31: Suppression of automaticity

Topic 32: Buddhism

Topic 33: Unclear

Topic 34: Worry

Topic 35: Cancer

Topic 36: Self-control

Topic 37: Alcohol dependency

Topic 38: Unclear

Topic 39: Unclear

Topic 40: Unclear

Topic 41: Unclear

Topic 42: Older adults

Topic 43: Unclear

Topic 44: Religion

Topic 45: Addiction

Topic 46: Intelligence

Topic 47: Unclear

Topic 48: Social anxiety disorder (SAD)

Topic 49: Cognitive behaviour therapy

Topic 50: Aggression

Topic 51: Pain

Topic 52: Identity

Topic 53: Unclear

Topic 54: Communication

Topic 55: Teacher

Topic 56: Psychosis

Topic 57: Quality of life

Topic 58: Unclear

Topic 59: Unclear

Topic 60: Neuroticism

Topic 61: Unclear

Topic 62: Mindful movement

Topic 63: Suicidal ideation

Topic 64: Unclear

Topic 65: Unclear

Topic 66: Therapist

Topic 67: Unclear

Topic 68: Unclear

Topic 69: Weight and dietary-related issues

Topic 70: Mindfulness-based intervention

Topic 71: Unclear

Topic 72: Mindfulness-based cognitive therapy (MBCT)

Topic 73: Rumination

Topic 74: Compassion

Topic 75: Unclear

Topic 76: Unclear

Topic 77: Unclear

Topic 78: Unclear

Topic 79: Unclear

Topic 80: Unclear

Topic 81: Unclear

Topic 82: Attention deficit hyperactivity disorder (ADHD)

Topic 83: Mindfulness-based stress reduction (MBSR)

Topic 84: Unclear

Topic 85: Adolescent

Topic 86: Job burnout

Topic 87: Sexual issues

Topic 88: Organisation

Topic 89: Partner/couple

Topic 90: Unclear

Topic 91: Smoking

Topic 92: Unclear

Topic 93: Parent-children

Topic 94: Chinese

Topic 95: Veteran-PTSD

Topic 96: Errors

Topic 97: Unclear

Topic 98: Unclear

Topic 99: Violence and trauma

Topic 100: Unclear

Topic 101: Unclear

Topic 102: Unclear

Topic 103: Unclear

Topic 104: Unclear

Topic 105: Unclear

Topic 106: Unclear

Appendix 3

Condition/Issue

Addiction

Aggression

Alcohol dependency

Alexithymia

Anger rumination

Attention deficit hyperactivity disorder (ADHD)

Bipolar disorder

Borderline personality disorder

Burnout

Cancer

Cardiac rehabilitation

Cell phone use

Childbirth

Childhood trauma

Chronic obstructive pulmonary disease (COPD)

Communication

Conflict

Craving

Death

Diabetes

Disaster

Discomfort

Eating

Errors

Fibromyalgia

Fibromyalgia syndrome (FMS)

Food consumption

Gambling

Generalised anxiety disorder (GAD)

Headache

Human immunodeficiency virus (HIV)

Hypertension

Infertility

Inflammatory responses

Injuries

Internet addiction

Intolerance

Major depressive disorder (MDD)

Media multitasking

Opioid use

Organ transplant

Pain

Posttraumatic stress disorder (PTSD)

Procrastination

Psychosis

Rehabilitation

Safety

Schizophrenia

Sexual issues

Sleep

Smoking

Social anxiety disorder (SAD)

Social media behaviour

Speech

Substance use

Suicidal ideation

Tinnitus

Trauma

Treatment-resistant depression (TRD)

Urgency

Violence

Voice hallucination

Weight

Worry

Appendix 4

Construct/Philosophy

Accuracy

Ambiguity

Ambivalence

Amygdala

Attention

Autobiographical memory

Automaticity

Boundary

Buddhism

Clarity

Cognitive fusion

Cognitive intrusion

Coherence

Compassion

Congruence

Contemplative science

Creativity

Curiosity

Decentering

Default mode network (DMN)

Defusion

Discrepancy

Dissociation

Distraction

Embodiment

Empathy

Ethics

Flourishing

Flow

Forgiveness

Gratitude

Happiness

Healing

Health-related quality of life (HRQOL)

Hypnosis

Identity

Imagery

Immersion

Implicit processes

Impulsivity

Indian

Intelligence

Interoceptive processes

Intuition

Journey

Joy

Locus of control

Love

Loving-kindness meditation

Metacognition

Mind-wandering (1)

Mind-wandering (2)

Mindlessness

Motor

Neuroticism

Nonattachment

Panic

Perfectionism

Psychological well-being

Quality of life

Reappraisal

Recall

Religion

Reward

Rumination

Self-esteem

Sense making

Serenity

Shame

Silence

Spirituality

Subjective well-being

Suppression

Transcendence

Trust

Values-based processes

Vipassana

Virtues

Vision

Wisdom

Zen

Appendix 5

Modality

Arts

Bibliotherapy

Cognitive behaviour therapy

Health enhancement programme (HEP)

Internet-based cognitive behavioural therapy (iCBT)

Internet-delivered intervention

Martial arts

Massive Open Online Course (MOOC)

Mind-body therapies

Mindfulness-based cognitive therapy (MBCT)

Mindfulness-based intervention

Mindfulness-based stress reduction (MBSR)

Mindfulness-based therapies

Mobile applications

Music

Phone-based intervention

Progressive muscle relaxation

Qigong

Retreat

Tai chi

Taiji

Virtual reality

Walk

Web app

Writing

Yoga

Appendix 6

Population/Setting

Adolescent

African

Agile software development

Athlete

Beginners

Caregivers

Chinese

Coach

Elderly

Ethnic minority

Health care worker burnout

Intergroup relations

Japan

Leadership

Learner

Mathematics

Mental health care staff

Nursing

Older adults

Organisation (1)

Organisation (2)

Palliative care

Parent-children

Partner/couple

Physician job burnout

Politics

Pregnancy

Psychologist well-being

Romantic attraction

Sport

Supervisory roles

Teacher

Teams

Therapist

Tourism

Veteran/military

Worksite

Youth

Appendix 7

Research Methodology

Biofeedback

Blood flow

Brain structure

Cortisol

Cross-cultural

Electroencephalogram (EEG)

Event-related potential (ERP)

Five Facet Mindfulness Questionnaire (FFMQ)

Genetics

Kentucky Inventory of Mindfulness Skills (KIMS)

Magnetoencephalography (MEG)

Mindful Attention Awareness Scale (MAAS)

Narrative

Priming

Profile of Mood States (POMS)

Rasch analysis

Spanish questionnaires

Story

Telomere

Text messages

Treatment as usual

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Kee, Y.H., Li, C., Kong, L.C. et al. Scoping Review of Mindfulness Research: a Topic Modelling Approach. Mindfulness 10, 1474–1488 (2019). https://doi.org/10.1007/s12671-019-01136-4

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