Neurobiological Substrate of Social Context on Cognitive Control in Drug Users

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

UNKNOWN

Clinical Phase

NA

Total Enrollment

50 participants

Study Classification

INTERVENTIONAL

Study Start Date

2018-04-16

Study Completion Date

2020-04-15

Brief Summary

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The aim of the present project is to reveal, using Functional Magnetic Resonance Imaging (fMRI) in drug users, a specific modulation of brain structures and circuits involved in cognitive control (and especially those of inhibitory control) and reward while subjects are performing under the influence of drug-associated cues and in various social contexts.

This hypothesis, based on the animal work, is that the subthalamic nucleus (STN) should play a critical role in these processes. Addictive behaviour can be seen as a loss of control resulting from reduced inhibitory control, leading to compulsive drug use. These disorders are known to be associated with a hypoactivation of specific frontal regions such as the anterior cingulate cortex or the prefrontal cortex.

For the present experiment, it is chosen to use a procedure well established for neurophysiological and behavioural assessment of inhibitory processes : the " stop-signal reaction time task ".

This task requires to inhibit a motor response (press a button) at the onset of a stop signal (a tone) that occurs while the response is already engaged. In this task associated with fMRI, it was previously shown that the STN is involved in the control of inhibition. These results confirm our data in the rat, and especially those showing that STN lesions block the ability to stop. The stop signal task will thus be appropriate to study the effect of the social context on inhibitory processes in a population of cocaine users.

In cocaine abusers, it was shown that inhibitory processes are affected. Here we aim at testing this population of subjects while they perform the stop task, but adding an implicit cognitive load induced by visual cues associated or not with cocaine intake. Since it want to assess the influence of a peer on both the performance and the associated cerebral activities, it will also control the presence of a peer observer in the procedure.

There will thus be three experimental factors, one inter-subject factor (the experimental group, cocaine users or controls) and two intra-subject factors (cocaine associated or neutral cue; presence of a peer observer). The "stop-signal" task should induce increased activity of the STN that should be modulated by the cocaine-associated cues and by the presence of a peer.

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Detailed Description

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Conditions

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Drug Use

Study Design

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Allocation Method

NON_RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

OTHER

Blinding Strategy

NONE

Study Groups

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Drug user

Regular use of cocaine

Group Type EXPERIMENTAL

Functional Magnetic Resonance Imaging (fRMI)

Intervention Type DEVICE

Acquisition of a functional MRI on the sub thalamic nucleus

Healthy volunteers

non-drug user

Group Type ACTIVE_COMPARATOR

Functional Magnetic Resonance Imaging (fRMI)

Intervention Type DEVICE

Acquisition of a functional MRI on the sub thalamic nucleus

Interventions

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Functional Magnetic Resonance Imaging (fRMI)

Acquisition of a functional MRI on the sub thalamic nucleus

Intervention Type DEVICE

Eligibility Criteria

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Inclusion Criteria

Drug Users Group

* age between 18 and 65 years
* regular use of cocaine and crack
* willing to participate
* able to give consent
* right-handed

Healthy volunteers group

* age between 18 and 65 years
* non-drug user
* willing to participate
* able to give consent
* right-handed

Exclusion Criteria

* protected persons
* lactating women
* intolerance to noise
* not a beneficiary of a social security scheme.
* no signature on the consent form
* significant psychiatric or neurological disorder
* known visual impairment and abnormal vision despite correction
* Contraindication to MRI examination
* Claustrophobia.
* Pregnant women

Minimum Eligible Age

18 Years

Maximum Eligible Age

65 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes