Healthy
Conditions
Keywords
nonverbal vocal communication, babies cries, pain tolerance, cold pressor test
Brief summary
Humans produce non-verbal vocalizations (shouting, growling, screaming), laughter, ...) in various contexts that are likely to perform biological functions. and important social issues. Yet despite their importance in the human vocal repertoire, the mechanisms and functions of non-verbal vocalizations remain little studied and poorly understood including in humans. In this context, the investigators wish to examine how the perception of vocalizations non-verbal aversive behaviours influence pain tolerance in healthy adults.
Detailed description
Humans produce nonverbal vocalisations such as screams, grunts, roars, cries and laughter across a variety of contexts. Yet despite the prominence and apparent importance of these nonverbal sounds in human communication, the investigators still know very little about their influence on human perception and behaviour. That's why, in this study, the investigators will examine specifically the influence of nonverbal vocal perception on pain tolerance. The remainder of the study will involve up to three trials of a pain tolerance (cold pressor) task, during which the investigators will ask participants to listen to vocalisations (e.g., babies' cries or babbling) while submerging the participant's hand in bath of circulating cold water. The results of the study will contribute to theoretical understanding of the functions of nonverbal vocal communication in humans, in particular the influence of nonverbal vocal and perception (of babies' cries) on pain tolerance.
Interventions
BEHAVIORALCold pressor task (CPT)
The cold pressor test is among the most common and established methods for studying human reactions to pain and pain tolerance. Participants submerge a hand in cold water (approx. 5°C) and are asked to keep their hand submerged for as long as can (until the sensation is intolerable), up to a maximum of 5 min. The procedure is safe because the hand is removed before adverse effects can occur. The participant will be given a break of 5 min in between trials, and will interchange hands between trials. During this break hand may to be place in warm water (25-35°C) for up to 4 min to normalise hand temperature, which will be measured before and after each trial using a digital thermometer held firmly in the palm of the hand. Each participant will complete no more than three trials (conditions) in a randomised order.
DIAGNOSTIC_TESTindex NOL
Measurement of the index NOL™: Four sensors, placed non-invasively on one of the four participants' fingers, will make it possible to calculate a dozen physiological parameters converts in real time into a pain index called NOL (for Nociception Level Index).
BEHAVIORALPlayback Experiments
During the experience, participants are led to listen, via headphones, to aversive non-verbal vocalizations (baby crying). The sound levels used to broadcast the non-verbal vocalisations will be scrupulously measured using approved and certified equipment during the preparation of the experiments. These sound volumes will be chosen so as not to inconvenience participants.
DIAGNOSTIC_TESTVideo-pupillometry
This technique is based on the observation of the dilatation of the pupil during the perception of a nociceptive stimulus in test persons.
Sponsors
Laboratoire ENES-CNPS (Université Lyon/Saint Etienne)
Centre Hospitalier Universitaire de Saint Etienne
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
BASIC_SCIENCE
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 60 Years
Healthy volunteers
Yes
Inclusion criteria
* Participant in good health * Affiliated or entitled participant in a social security scheme * Participant who received informed information about the study and co-signed, with the investigator, a consent to participate in the study
Exclusion criteria
* Chronic pain * High blood pressure or poor circulation * Cardiac or vascular disease, or a heart condition (including symptoms of Raynaud's syndrome) * Allergy or hypersensitivity to cold * Diabetes * Epilepsy * Pregnancy * Recent serious injury * Neurological or psychiatric condition known to affect pain tolerance (e.g., peripheral neuropathy, schizophrenia) * History of fainting or seizures * History of frostbite
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Pain tolerance | at inclusion | Delay (in seconds) in removing the hand when testing the Cold Pressor. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Onset of pain | at inclusion | Participant verbally indicates when he or she begins to feel the sensation of pain (time of onset measured in seconds). |
| Pain intensity | at inclusion | Subjective assessment of maximum pain intensity by participants for a given trial. Measured by scale of 0 (no pain) at 100 (extreme pain). |
| Correlation between NOL index and video pupillometry results | at inclusion | Measurement of the NOL index (index ranging from 0 to 100) and measurement of pupillary diameter and its variations (in mm) in response to nociceptive stimuli by video pupillometry. |
Countries
France
Contacts
Primary ContactRoland PEYRON, MD
Backup ContactHélène RAINGARD, CRA
Outcome results
None listed