Ignite Creation Date:
2024-05-05 @ 11:36 AM
Last Modification Date:
2024-10-26 @ 9:10 AM
Study NCT ID:
NCT00080548
Status:
COMPLETED
Last Update Posted:
2017-07-02
First Post:
2004-04-07
Brief Title:
Timing of Voluntary Movement in Patients With Schizophrenia
Sponsor:
National Institute of Neurological Disorders and Stroke NINDS
Organization:
National Institutes of Health Clinical Center CC
Study Overview
Official Title:
Timing of Voluntary Movement in Patients With Schizophrenia Using EEG and Surface EMG
Status:
COMPLETED
Status Verified Date:
2009-01-06
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
This study will examine and compare how the brain controls the timing of movement in healthy volunteers and in people with schizophrenia Previous experiments have shown that when people are asked to look at a clock and report the time they first decide to make a movement they report times later than the first brain waves associated with movement appear When they are asked to report the time they first initiate the movement they report times before the muscles actually begin to move The study may help determine how the sense of willing and initiating an action is altered in schizophrenic patients and how people may feel more or less in control of their movements
Normal volunteers and patients with schizophrenia between 18 and 65 years of age may be eligible for this study Control subjects must not have any neurological or psychological disorders and schizophrenia patients must not have any other neurological disorders
All participants will have a medical history physical examination and a test to determine their level of attention Schizophrenia patients will be interviewed about their symptoms and complete psychiatric rating scales In addition all participants will undergo the following procedures
Electric shock
Participants look at a clock on a computer screen whose hands revolves around the clock fast While they look at the clock they are given small non-painful electric shocks and are asked to say when they receive the shocks according to the clock The shocks are repeated 40 times
Arm movement
Participants are asked to lift their arm up off a table repeatedly at random times while they look at the computer clock This exercise is repeated a total of 80 times Of these 80 times participants are asked 10 times in a row to say the time they first had the desire to move their arm and then 10 times in a row the time they first felt that they were moving their arm
Electroencephalography EEG and Electromyography EMG
Participants undergo EEG and EMG during the electric shock and arm movement experiments to measure electrical activity of the brain EEG and of the muscles EMG For EEG electrodes small metal discs are placed on the scalp with a cap paste or glue-like substance and the brain waves are recorded For EMG electrodes are taped to the skin over the muscle
Normal volunteers and patients with schizophrenia between 18 and 65 years of age may be eligible for this study Control subjects must not have any neurological or psychological disorders and schizophrenia patients must not have any other neurological disorders
All participants will have a medical history physical examination and a test to determine their level of attention Schizophrenia patients will be interviewed about their symptoms and complete psychiatric rating scales In addition all participants will undergo the following procedures
Electric shock
Participants look at a clock on a computer screen whose hands revolves around the clock fast While they look at the clock they are given small non-painful electric shocks and are asked to say when they receive the shocks according to the clock The shocks are repeated 40 times
Arm movement
Participants are asked to lift their arm up off a table repeatedly at random times while they look at the computer clock This exercise is repeated a total of 80 times Of these 80 times participants are asked 10 times in a row to say the time they first had the desire to move their arm and then 10 times in a row the time they first felt that they were moving their arm
Electroencephalography EEG and Electromyography EMG
Participants undergo EEG and EMG during the electric shock and arm movement experiments to measure electrical activity of the brain EEG and of the muscles EMG For EEG electrodes small metal discs are placed on the scalp with a cap paste or glue-like substance and the brain waves are recorded For EMG electrodes are taped to the skin over the muscle
Detailed Description:
Objectives
The purpose of this study is to determine how the subjective sense of willing and initiating an action is altered in schizophrenic patients One proposed explanation for characteristic symptoms of schizophrenia passivity phenomena is a defect in the forward model of movement that the brain receives as the motor signal is generated We propose to examine this forward model using Libets paradigm in which normal subjects gave evidence for a forward model in their anticipatory reports of initiation of movement We intend to determine the times associated with willing W initiating M and electroencephalographicelectromyographic EEGEMG measures of movement
Study Population
We intend to study adult patients with a Diagnostic and Statistical Manual of Mental Disorders diagnosis of schizophrenia These patients provide a unique population for this study because they often do not have the sense that they direct their own movement or author their own thoughts passivity phenomena Studies have shown that schizophrenics have movement-related cortical potentials on EEG but it is not known when the subjective sense of initiating movement occurs for these patients As the order of mental events in time has been shown to contribute to the sense of agency it is important to know how the timing of voluntary movement is altered in schizophrenia
Design
We will ask patients to look at a fast-rotating clock on a computer screen and note when their movements were willed instigated by an external agent if they have such delusions and were initiated Patients will also report the time of a somatosensory stimulus Surface EMG will determine the time of actual movement and EEG will record brain potentials associated with movement Eligible patients with schizophrenia and passivity phenomena will be recruited from the Clinical Brain Disorders Branch NIMH
Outcome Measures
The primary outcome measure of this study is the absence of time W in some schizophrenics the latency of W in other schizophrenics compared to normal subjects and the latency of M in schizophrenics compared to normals Any effect of medication status or symptoms on performance in the study will be considered exploratory data
The purpose of this study is to determine how the subjective sense of willing and initiating an action is altered in schizophrenic patients One proposed explanation for characteristic symptoms of schizophrenia passivity phenomena is a defect in the forward model of movement that the brain receives as the motor signal is generated We propose to examine this forward model using Libets paradigm in which normal subjects gave evidence for a forward model in their anticipatory reports of initiation of movement We intend to determine the times associated with willing W initiating M and electroencephalographicelectromyographic EEGEMG measures of movement
Study Population
We intend to study adult patients with a Diagnostic and Statistical Manual of Mental Disorders diagnosis of schizophrenia These patients provide a unique population for this study because they often do not have the sense that they direct their own movement or author their own thoughts passivity phenomena Studies have shown that schizophrenics have movement-related cortical potentials on EEG but it is not known when the subjective sense of initiating movement occurs for these patients As the order of mental events in time has been shown to contribute to the sense of agency it is important to know how the timing of voluntary movement is altered in schizophrenia
Design
We will ask patients to look at a fast-rotating clock on a computer screen and note when their movements were willed instigated by an external agent if they have such delusions and were initiated Patients will also report the time of a somatosensory stimulus Surface EMG will determine the time of actual movement and EEG will record brain potentials associated with movement Eligible patients with schizophrenia and passivity phenomena will be recruited from the Clinical Brain Disorders Branch NIMH
Outcome Measures
The primary outcome measure of this study is the absence of time W in some schizophrenics the latency of W in other schizophrenics compared to normal subjects and the latency of M in schizophrenics compared to normals Any effect of medication status or symptoms on performance in the study will be considered exploratory data
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
None
Is a FDA Regulated Device?:
None
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None
Secondary IDs
| Secondary ID | Type | Domain | Link |
|---|---|---|---|
| 04-N-0151 | None | None | None |