Paired Associative Stimulation in Methamphetamine Addiction

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

90 participants

Study Classification

INTERVENTIONAL

Study Start Date

2019-05-01

Study Completion Date

2022-03-31

Brief Summary

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The investigators use paired associative stimulation (PAS) protocols to target cortico-cortical and cortico-subcortical networks to study cognitive deficits in methamphetamine addiction.

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Detailed Description

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Paired associative stimulation (PAS) is a form of transcranial magnetic stimulation in which paired pulses can induce plasticity at cortical synapses, producing long-term potentiation (LTP) or long-term depression (LTD) effect. The investigators use paired associative stimulation (PAS) protocols to target cortico-cortical and cortico-subcortical networks (frontoparietal control pathway) by using different intervals between the paired pulses to explore the mechanism of cognitive deficits in methamphetamine addiction. The investigators hypothesize that different temporal sequences of cortical stimulation could produce facilitation or inhibition effect.

Conditions

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Methamphetamine-dependence

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

BASIC_SCIENCE

Blinding Strategy

DOUBLE

Participants Investigators

Study Groups

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DLPFC+10 IPL

Stimulation of dorsolateral prefrontal cortex (DLPFC) 10 ms before inferior parietal lobule (IPL) presumes that the DLPFC to IPL input facilitates insula postsynaptic output activity, thereby improving cognition response via a long term potentiation-like effect.

Group Type EXPERIMENTAL

MagPro X100 device (MagVenture, Farum, Denmark)

Intervention Type DEVICE

Each cPAS experimental session contained 100 pairs of stimuli at 0.2 Hz. The experimental conditions differed in the interstimulus interval of the paired pulses. DLPFC stimulation precedes IPL/MPFC stimulation by 10 ms (DLPFC+10) or by 4 ms (DLPFC+4), and IPL/MPFC stimulation precedes DLPFC stimulation by 4 ms (IPL/MPFC+4) or by 10 ms (IPL+10).

IPL+10 DLPFC

Stimulation of IPL 10 ms before DLPFC presumes that the IPL to DLPFC input inhibits insula postsynaptic output activity, thereby impairing cognition response via a long term depression-like effect.

Group Type EXPERIMENTAL

MagPro X100 device (MagVenture, Farum, Denmark)

Intervention Type DEVICE

Each cPAS experimental session contained 100 pairs of stimuli at 0.2 Hz. The experimental conditions differed in the interstimulus interval of the paired pulses. DLPFC stimulation precedes IPL/MPFC stimulation by 10 ms (DLPFC+10) or by 4 ms (DLPFC+4), and IPL/MPFC stimulation precedes DLPFC stimulation by 4 ms (IPL/MPFC+4) or by 10 ms (IPL+10).

IPL+4 DPLFC

Stimulation of IPL 4 ms before DLPFC is presumed to be too brief for a corticocortical effect but presumes that the DLPFC input to insula inhibits insula postsynaptic output by weakening the IPL to insula input, thereby impairing cognition response.

Group Type EXPERIMENTAL

MagPro X100 device (MagVenture, Farum, Denmark)

Intervention Type DEVICE

Each cPAS experimental session contained 100 pairs of stimuli at 0.2 Hz. The experimental conditions differed in the interstimulus interval of the paired pulses. DLPFC stimulation precedes IPL/MPFC stimulation by 10 ms (DLPFC+10) or by 4 ms (DLPFC+4), and IPL/MPFC stimulation precedes DLPFC stimulation by 4 ms (IPL/MPFC+4) or by 10 ms (IPL+10).

DLPFC+4 IPL

Stimulation of DLPFC 4 ms before IPL is presumed to be too brief for a corticocortical effect but presumes that the DLPFC input to insula potentiates insula postsynaptic output by strengthening the IPL to insula input, thereby improving cognition response.

Group Type EXPERIMENTAL

MagPro X100 device (MagVenture, Farum, Denmark)

Intervention Type DEVICE

Each cPAS experimental session contained 100 pairs of stimuli at 0.2 Hz. The experimental conditions differed in the interstimulus interval of the paired pulses. DLPFC stimulation precedes IPL/MPFC stimulation by 10 ms (DLPFC+10) or by 4 ms (DLPFC+4), and IPL/MPFC stimulation precedes DLPFC stimulation by 4 ms (IPL/MPFC+4) or by 10 ms (IPL+10).

DLPFC+4 MPFC

Stimulation of DLPFC 4 ms before medial prefrontal cortex (MPFC) presumes that the DLPFC input facilitates MPFC postsynaptic output activity, thereby improving cognition response via a long term potentiation-like effect.

Group Type EXPERIMENTAL

MagPro X100 device (MagVenture, Farum, Denmark)

Intervention Type DEVICE

Each cPAS experimental session contained 100 pairs of stimuli at 0.2 Hz. The experimental conditions differed in the interstimulus interval of the paired pulses. DLPFC stimulation precedes IPL/MPFC stimulation by 10 ms (DLPFC+10) or by 4 ms (DLPFC+4), and IPL/MPFC stimulation precedes DLPFC stimulation by 4 ms (IPL/MPFC+4) or by 10 ms (IPL+10).

MPFC+4 DLPFC

Stimulation of MPFC 4 ms before DLPFC presumes that the DLPFC input inhibits MPFC postsynaptic output activity, thereby impairing cognition response via a long term depression-like effect.

Group Type EXPERIMENTAL

MagPro X100 device (MagVenture, Farum, Denmark)

Intervention Type DEVICE

Each cPAS experimental session contained 100 pairs of stimuli at 0.2 Hz. The experimental conditions differed in the interstimulus interval of the paired pulses. DLPFC stimulation precedes IPL/MPFC stimulation by 10 ms (DLPFC+10) or by 4 ms (DLPFC+4), and IPL/MPFC stimulation precedes DLPFC stimulation by 4 ms (IPL/MPFC+4) or by 10 ms (IPL+10).

DLPFC+10 MPFC

Stimulation of DLPFC 10 ms before medial prefrontal cortex (MPFC) presumes that the DLPFC input facilitates MPFC postsynaptic output activity, thereby improving cognition response via a long term potentiation-like effect.

Group Type EXPERIMENTAL

MagPro X100 device (MagVenture, Farum, Denmark)

Intervention Type DEVICE

Each cPAS experimental session contained 100 pairs of stimuli at 0.2 Hz. The experimental conditions differed in the interstimulus interval of the paired pulses. DLPFC stimulation precedes IPL/MPFC stimulation by 10 ms (DLPFC+10) or by 4 ms (DLPFC+4), and IPL/MPFC stimulation precedes DLPFC stimulation by 4 ms (IPL/MPFC+4) or by 10 ms (IPL+10).

MPFC+10 DLPFC

Stimulation of MPFC 10 ms before DLPFC presumes that the DLPFC input inhibits MPFC postsynaptic output activity, thereby impairing cognition response via a long term depression-like effect.

Group Type EXPERIMENTAL

MagPro X100 device (MagVenture, Farum, Denmark)

Intervention Type DEVICE

Each cPAS experimental session contained 100 pairs of stimuli at 0.2 Hz. The experimental conditions differed in the interstimulus interval of the paired pulses. DLPFC stimulation precedes IPL/MPFC stimulation by 10 ms (DLPFC+10) or by 4 ms (DLPFC+4), and IPL/MPFC stimulation precedes DLPFC stimulation by 4 ms (IPL/MPFC+4) or by 10 ms (IPL+10).

Interventions

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MagPro X100 device (MagVenture, Farum, Denmark)

Each cPAS experimental session contained 100 pairs of stimuli at 0.2 Hz. The experimental conditions differed in the interstimulus interval of the paired pulses. DLPFC stimulation precedes IPL/MPFC stimulation by 10 ms (DLPFC+10) or by 4 ms (DLPFC+4), and IPL/MPFC stimulation precedes DLPFC stimulation by 4 ms (IPL/MPFC+4) or by 10 ms (IPL+10).

Intervention Type DEVICE

Eligibility Criteria

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Inclusion Criteria

* In accordance with the Diagnostic and Statistical Manual of Mental Disorders-5 (DSM-5) for methamphetamine (MA) use disorders
* Junior high school degree or above
* Normal vision and hearing
* Dextromanual

Exclusion Criteria

* Have a disease that affect cognitive function such as history of head injury, cerebrovascular disease, epilepsy, etc
* Have cognitive-promoting drugs in the last 6 months
* Other substance abuse or dependence in recent five years (except nicotine)
* Mental impairment, Intelligence Quotient (IQ) \< 70
* Mental disorders
* Physical disease

Minimum Eligible Age

18 Years

Maximum Eligible Age

45 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes