Executive Control Analysis in Patients Suffering From Parkinson Disease and Treated by Deep Brain Stimulation
NCT ID: NCT00922909
Last Updated: 2014-02-25
Study Results
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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COMPLETED
NA
16 participants
INTERVENTIONAL
2009-06-30
Brief Summary
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A reaction time task, known as the "Simon task" in the literature, allows one to study the influence of irrelevant visual information on decision making. In the most common version of this task (used in the prosed study), the subjects have to choose between a left- and a right-hand keypress according to the color of a visual signal presented either to the left or to the right of a fixation. The to be established association is said "congruent" when the response is ipsilateral to the stimulus and "incongruent" when the response is contralateral to the stimulus. In healthy volunteers, EMG investigations have revealed that in a significant numbers of trials, the contraction of the response agonist is preceded by a infra-liminal contraction of the agonist involved in the non-required response. Such "partial errors" demonstrate that the nervous system is able to detect, abort and correct a part of its errors, thereby revealing the existence of an on-line executive control in simple decision tasks. Behavioral studies performed in Parkinson disease patients, suggest that these patients may experience a deficit in such a control.
The present study aims at testing this hypothesis by assessing the effect of subthalamic stimulation on the patients' performance in a Simon task.
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Detailed Description
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A reaction time task, known as the "Simon task" in the literature, allows one to study the influence of irrelevant visual information on decision making. In the most common version of this task (used in the prosed study), the subjects have to choose between a left- and a right-hand keypress according to the color of a visual signal presented either to the left or to the right of a fixation. The to be established association is said "congruent" when the response is ipsilateral to the stimulus and "incongruent" when the response is contralateral to the stimulus. In healthy volunteers, EMG investigations have revealed that in a significant numbers of trials, the contraction of the response agonist is preceded by a infra-liminal contraction of the agonist involved in the non-required response. Such "partial errors" demonstrate that the nervous system is able to detect, abort and correct a part of its errors, thereby revealing the existence of an on-line executive control in simple decision tasks. Behavioral studies performed in Parkinson disease patients, suggest that these patients may experience a deficit in such a control.
Aims
The present study aims at testing this hypothesis by assessing the effect of subthalamic stimulation on the patients' performance in a Simon task.
Methods
Sixteen non-demented Parkinson disease patients treated by deep brain stimulation will be involved in the study. They will perform a Simon task in four conditions: Stimulator ON vs. OFF x Medication ON vs. OFF. The EMG activity of the response agonist will be recorded during task performance. Such recordings will allow the investigator to uncover partial errors. This index together with reaction time and overt errors will be subsequently analysed.
Expected results
Deep brain stimulation (as oral Dopaminergic medication) re-install the patient motor functions and it is thus predicted that both the stimulation and the medication improve the patients executive control by increasing the proportion of partial errors relative to overt errors. Such a result would demonstrate that the nigro-striatal pathways in directly involved in executive control during decision making.
Conditions
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Study Design
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RANDOMIZED
CROSSOVER
BASIC_SCIENCE
NONE
Study Groups
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2
Day 1 : morning : Medication on ; Stimulation : off afternoon : Medication : on ; Stimulation : on Day 2 : morning : Medication : off ; Stimulation : off afternoon : medication : off ; stimulation : on
Simon task
Reaction time task
3
Day 1 : morning : Medication off ; Stimulation : on afternoon : Medication : off ; Stimulation : off Day 2 : morning : Medication : on ; Stimulation : on afternoon : medication : on ; stimulation : off
Simon task
Reaction time task
4
Day 1 : morning : Medication off ; Stimulation : off afternoon : Medication : off ; Stimulation : on Day 2 : morning : Medication : on ; Stimulation : off afternoon : medication : on ; stimulation : on
Simon task
Reaction time task
1
Day 1 : morning : Medication on ; Stimulation on afternoon : Medication on ; Stimulation off Day 2 : morning : Medication off ; Stimulation on afternoon : Medication off ; Stimulation off
Simon task
Reaction time task
Interventions
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Simon task
Reaction time task
Eligibility Criteria
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Inclusion Criteria
* Mattis score \> 130,MMSE \> 24
* No subthalamic stimulation for 6 months
* No depressive disease evoluting
Exclusion Criteria
* Psychotropic treatment introduced for less than a month
18 Years
ALL
No
Sponsors
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Assistance Publique Hopitaux De Marseille
OTHER
Responsible Party
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Principal Investigators
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Jean-Philippe AZULAY
Role: PRINCIPAL_INVESTIGATOR
Assistance Publique-Hôpitaux de Marseille
Locations
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Assistance Publique-Hopitaux de Marseille
Marseille, , France
Countries
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Other Identifiers
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2009-A00333-54
Identifier Type: -
Identifier Source: secondary_id
2009/14
Identifier Type: -
Identifier Source: org_study_id
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