Is There a Desensitization During Sleep After Exposure to a Violent Verbal Input ?

Study Overview
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Brief Summary
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There is a need for quantify the emotional and neurophysiological perception of verbal violence, in order to understand the impact it might have on a subject. This project aims at assessing the influence of time, sleep, and people interaction on the perception of verbal violence.

Detailed Description
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There are many processes involved in the perception of verbal violence. There is a need for quantified data to have a better understanding the physiological and neurological perception of verbal violence, in order to understand the impact it might have on a subject. This project aims at assessing the influence of time, sleep, and people interaction on the perception of verbal violence. The cognitive replay will also be assessed through dreams. The investigators think that sleep plays a role in desensitization to negative emotions and to memory consolidation. However, the role of sleep in verbal violence remains unknown.

Official Title
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Y a T-il Une désensibilisation Pendant le Sommeil après la réception de Violence Verbale ?

Conditions
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Verbal Abuse

Intervention / Treatment
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* Behavioral: Watching Video-clip 1
* Behavioral: Watching Video-clip 2


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Subject fully understands French Subject willing to consent to the study and signed the written consent Subject is afiliated to the Freanch national health care system (Sécurité Sociale) Subject level of education superior to Brevet des collèges (an equivalent would be the general certificate of secondary education) Exclusion Criteria: The subject is not able to understand the protocol The subject has a language disorder The subject has a psychiatric or neurological disorders The subject does not use psychotropic drugs The subject has watched the advertidement : stop djihadisme, broadcasted on television by the french government

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 25 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Other
Allocation: Randomized
Intervention Model: Crossover Assignment
Interventional Model Description: Watching two different videos (one violent, one non-violent), re-exposure after 11h daytime (wake period) or 11h nighttime (sleep period). The order of videos is balanced, in a cross over fashion
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Night-time desensitization<br>Watching a video containing verbal and visual violence in the evening, and again in the next morning | Behavioral: Watching Video-clip 1<br>* Video -clip 1 contains violent images and text<br>Behavioral: Watching Video-clip 2<br>* Video -clip 2 contains neutral images and text<br>|
| Sham Comparator: Daytime desensitization<br>Watching a video containing verbal and visual non-violence in the morning, and then again the evening of the same day | Behavioral: Watching Video-clip 1<br>* Video -clip 1 contains violent images and text<br>Behavioral: Watching Video-clip 2<br>* Video -clip 2 contains neutral images and text<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Heart rate | heart rate in beat per min | During each video exposure (duration 1.2 min), 4 times | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Sweating | measure of electrodermal reaction, in millivolts | During the video exposure (duration 1.2 min), 4 times | 
| Vasoconstriction | measure of the pulse wave, in millivolts | During the video exposure (duration 1.2 min), 4 times | 
| Emotions | Analogic visual scales, in mm | Just after the video exposure, during 1 min | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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sleep, verbal abuse, polysomnography, perception, neuropsychological tests