Sociocultural & Biobehavioral Influences on Pain Expression and Assessment

  • participants needed
  • sponsor
    National Center for Complementary and Integrative Health (NCCIH)
Updated on 31 January 2023
pain assessment
Accepts healthy volunteers



People can feel different levels of pain. This may depend on social, cultural, and biological factors. These factors can also influence how people respond to each other, and how they judge other people s experiences. Researchers want to learn more about these relationships.


To study if social and cultural factors lead to differences in pain experience and how pain is interpreted by other individuals.


Healthy adults ages 18-60


Participants will have 1 or 2 visits.

Participants will be screened with a medical history and nursing assessment.

Participants may have the following:

Electric shock through small sticky pads on the arm, leg, or foot.

Thermal stimulation. A device called a thermode will be placed on the arm, leg, or foot. A computer controls the thermode temperature.

Lowering their hand into very cold water.

Videos or pictures of the face will recorded while participants get painful stimulation.

A test to record heart electrical activity. Small metal disc or sticky pad electrodes will be placed on the chest.

Pulse rate and breathing measured. Sweating will be measured with two small sensors stuck on the hand.

A test to measure the electrical activity of facial muscles. Small metal disk or sticky pad electrodes will be attached to the skin.

Viewing pictures and/or videos of other people who get painful and nonpainful stimulation.

Participants will make decisions about the images. They will respond by keyboard, mouse, or button.

Eye tracking. A camera will measure participants pupil size and follow their eye movements.




The current proposal investigates behavioral, psychophysiological, and social processes that may help explain biases and disparate outcomes in pain. Health disparities, or health outcomes that adversely affect disadvantaged populations, are pervasive and apparent in many diseases and symptoms, including pain. Pain is the number one reason individuals seek medical treatment. Health disparities in pain encompass both differences in pain experience and treatment for pain. For instance, research indicates that Black individuals report increased pain and have reduced pain tolerance relative to White individuals, yet doctors are less likely to treat minority patients pain and underestimate their pain experience. This project aims to address this systemic discrepancy by focusing on interpersonal processes that may contribute to these disparities, including socially-relevant responses to pain (i.e. pain expression) and pain assessment (e.g. visual attention). The proposed research aims to determine whether the study of pain expressions and their assessment can yield insights on how social factors shape pain and its treatment. Further, we test the efficacy of potential interventions designed to improve accuracy and reduce biases in pain assessment. If successful, this work will form the foundation of a new research program that will link the field of pain research with the field of social neuroscience, and forge new insights on the critical problem of health disparities in pain.

Study population

We will accrue up to 600 total healthy volunteers to target 212 completers


Our overall aim is to understand how social factors influence the assessment and management of pain, and to gain insight into psychosocial processes that may underlie health disparities in pain. We propose a series of studies designed to test these links. First, we will measure pain perception and physiological responses to painful stimuli in a diverse group of individuals to test for sociocultural and biological influences on pain and pain-related responses. In subsequent studies, new participants ("perceivers") will view images of these initial participants ("targets") and will provide estimates of targets' pain experience. We will measure a) whether perceivers can accurately estimate targets' pain experience; b) whether accuracy differs as a function of similarity between target and perceiver (ingroup vs outgroup); and c) whether individuals can improve accuracy through feedback.

Outcome measures

Primary outcome measures for all experiments will be decisions about pain (experienced by self or other) measured with visual analogue scales, reaction time, and/or categorical judgments (pain/no pain). We will also measure physiological responses (e.g., facial muscle response, skin conductance, pupil dilation) as secondary outcome measures. We will test whether pain and pain-related responses varies as a function of sociocultural/demographic factors (e.g. race, ethnicity, gender) and whether accuracy in assessing others pain is influenced by group similarity (i.e. ingroup vs. outgroup) and training (e.g. performance-related feedback).

Condition Normal Physiology, Healthy Volunteers, Pain
Treatment Medoc thermal stimulator, Electric shock stimulator, Cold water bath, Instructions about pain assessment, Pain assessment performance feedback
Clinical Study IdentifierNCT03258580
SponsorNational Center for Complementary and Integrative Health (NCCIH)
Last Modified on31 January 2023

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