User Tutorial:Performing a Mu Rhythm Feedback Session - Revision history

Mellinger: /* Instructions to the Subject */

2020-02-27T14:39:17Z

Instructions to the Subject

← Older revision		Revision as of 14:39, 27 February 2020
Line 22:		Line 22:
	When a target is presented, the subject should engage the type of movement associated with the channel-frequency features [[User Tutorial:Analyzing the Initial Mu Rhythm Session\|chosen for feedback]]. In our example, since the largest r-squared value was associated with "right hand vs. rest", when the target is on the '''bottom edge''', move right hand; when the target is on the '''top edge''', stay rest.		When a target is presented, the subject should engage the type of movement associated with the channel-frequency features [[User Tutorial:Analyzing the Initial Mu Rhythm Session\|chosen for feedback]]. In our example, since the largest r-squared value was associated with "right hand vs. rest", when the target is on the '''bottom edge''', move right hand; when the target is on the '''top edge''', stay rest.

	In the first feedback Session, the motion of the cursor might not follow the behavior of the subject. This is because the ''Adaptaion'' mode is on. In '''Filtering''' tab, ''Adaptation'' box contains two numbers <tt>0 2</tt>. As our example involves only one dimensional control, the horizontal component is <tt>0</tt>. By having <tt>2</tt> on the ~~vertial~~ component, the ~~linear classifier~~ will "learn" the best ~~coeficient~~ to distinguish the difference of mu power between "right hand" and "rest". When the first session, or the "learning session" ended, one can set the vertical component to <tt>0</tt>, and subject can then try to gain control on the cursor.		In the first feedback Session, the motion of the cursor might not follow the behavior of the subject. This is because the ''Adaptaion'' mode is on. In '''Filtering''' tab, ''Adaptation'' box contains two numbers <tt>0 2</tt>. As our example involves only one dimensional control, the horizontal component is <tt>0</tt>. By having <tt>2</tt> on the vertical component, the normalizer will "learn" the best coefficient to distinguish the difference of mu power between "right hand" and "rest". When the first session, or the "learning session" ended, one can set the vertical component to <tt>0</tt>, and subject can then try to gain control on the cursor.

	Explicitly specifying a type of imagination to control cursor movement will help the subject achieve initial cursor control. Once the subject has become more proficient with the task, motor imagery typically becomes less important. In this situation, it is not uncommon that subjects report that they just "imagine to move the cursor."		Explicitly specifying a type of imagination to control cursor movement will help the subject achieve initial cursor control. Once the subject has become more proficient with the task, motor imagery typically becomes less important. In this situation, it is not uncommon that subjects report that they just "imagine to move the cursor."

Ckong: /* Multiple Sessions */

2019-07-25T19:20:56Z

Multiple Sessions

← Older revision		Revision as of 19:20, 25 July 2019
Line 75:		Line 75:
	After each session, it is recommended that you analyze the recorded data in the same way as you did for the [[User_Tutorial:Obtaining_Mu_Rhythm_Parameters_in_an_Initial_Session\|initial session]]. This allows you to track and adapt to signal changes in the subject's parameters that may occur in the course of learning.		After each session, it is recommended that you analyze the recorded data in the same way as you did for the [[User_Tutorial:Obtaining_Mu_Rhythm_Parameters_in_an_Initial_Session\|initial session]]. This allows you to track and adapt to signal changes in the subject's parameters that may occur in the course of learning.

	As mentioned in [[User Tutorial:Introduction to the Mu Rhythm#Behavioral Properties\|introduction]], ERD and ERS's occurrence ~~doesn~~'t require a physical presence of movements. Using the same methodology, subject can try to the cursor with pure imaginations. Explicitly specifying a type of imagination to control cursor movement will help the subject achieve initial cursor control. Once the subject has become more proficient with the task, motor imagery typically becomes less important. In this situation, it is not uncommon that subjects report that they just "imagine to move the cursor."		As mentioned in [[User Tutorial:Introduction to the Mu Rhythm#Behavioral Properties\|introduction]], ERD and ERS's occurrence don't require a physical presence of movements. Using the same methodology, subject can try to the cursor with pure imaginations. Explicitly specifying a type of imagination to control cursor movement will help the subject achieve initial cursor control. Once the subject has become more proficient with the task, motor imagery typically becomes less important. In this situation, it is not uncommon that subjects report that they just "imagine to move the cursor."


	==Important Remarks==		==Important Remarks==

Ckong at 19:20, 25 July 2019

2019-07-25T19:20:06Z

← Older revision		Revision as of 19:20, 25 July 2019
Line 74:		Line 74:

	After each session, it is recommended that you analyze the recorded data in the same way as you did for the [[User_Tutorial:Obtaining_Mu_Rhythm_Parameters_in_an_Initial_Session\|initial session]]. This allows you to track and adapt to signal changes in the subject's parameters that may occur in the course of learning.		After each session, it is recommended that you analyze the recorded data in the same way as you did for the [[User_Tutorial:Obtaining_Mu_Rhythm_Parameters_in_an_Initial_Session\|initial session]]. This allows you to track and adapt to signal changes in the subject's parameters that may occur in the course of learning.

			As mentioned in [[User Tutorial:Introduction to the Mu Rhythm#Behavioral Properties\|introduction]], ERD and ERS's occurrence doesn't require a physical presence of movements. Using the same methodology, subject can try to the cursor with pure imaginations. Explicitly specifying a type of imagination to control cursor movement will help the subject achieve initial cursor control. Once the subject has become more proficient with the task, motor imagery typically becomes less important. In this situation, it is not uncommon that subjects report that they just "imagine to move the cursor."


	==Important Remarks==		==Important Remarks==

Ckong: /* Multiple Sessions */

2019-07-25T19:10:39Z

Multiple Sessions

← Older revision		Revision as of 19:10, 25 July 2019
Line 60:		Line 60:

	==Multiple Sessions==		==Multiple Sessions==
	Once a run has ended, BCI2000 goes into suspended state.		Once the initial run has ended, BCI2000 goes into suspended state.
	~~Further runs will be added~~ to the ~~session when~~ you ~~click~~ ''Resume''.		[[Image:GainControl.PNG\|right\|800px]]
			As discussed above, you can now change the ''Adaptation'' vertical component from <tt>2</tt> to <tt>0</tt>.
			To control sensitivity of the cursor, you can increase the vertical component of the ''NormalizerGains''.

			Click '''Resume''' to test out the gain value.
	After the session has finished, you may want to save auto-adjusted parameters for the next session.		After the session has finished, you may want to save auto-adjusted parameters for the next session.
	Use ''Save Parameters'' from the configuration window to do this.		Use ''Save Parameters'' from the configuration window to do this.

Ckong: /* Instructions to the Subject */

2019-07-25T18:52:10Z

Instructions to the Subject

← Older revision		Revision as of 18:52, 25 July 2019
Line 9:		Line 9:

	==Instructions to the Subject==		==Instructions to the Subject==
	~~[[Image:CursorTask.PNG\|right\|400px]]~~
	When the subject is ready for EEG acquisition, it is time to brief the subject about the experimental task. Suggested instructions to the experimenter and subject are listed below.		When the subject is ready for EEG acquisition, it is time to brief the subject about the experimental task. Suggested instructions to the experimenter and subject are listed below.

			[[Image:CursorTask.PNG\|right\|400px]]
	A screen with a black background is initially presented. As soon as the subject is		A screen with a black background is initially presented. As soon as the subject is
	ready and the EEG traces are stabilized, the investigator will start the		ready and the EEG traces are stabilized, the investigator will start the

Ckong: /* Instructions to the Subject */

2019-07-25T18:51:32Z

Instructions to the Subject

← Older revision		Revision as of 18:51, 25 July 2019
Line 9:		Line 9:

	==Instructions to the Subject==		==Instructions to the Subject==
			[[Image:CursorTask.PNG\|right\|400px]]
	When the subject is ready for EEG acquisition, it is time to brief the subject about the experimental task. Suggested instructions to the experimenter and subject are listed below.		When the subject is ready for EEG acquisition, it is time to brief the subject about the experimental task. Suggested instructions to the experimenter and subject are listed below.

Ckong at 18:32, 25 July 2019

2019-07-25T18:32:27Z

← Older revision		Revision as of 18:32, 25 July 2019
Line 20:		Line 20:

	When a target is presented, the subject should engage the type of movement associated with the channel-frequency features [[User Tutorial:Analyzing the Initial Mu Rhythm Session\|chosen for feedback]]. In our example, since the largest r-squared value was associated with "right hand vs. rest", when the target is on the '''bottom edge''', move right hand; when the target is on the '''top edge''', stay rest.		When a target is presented, the subject should engage the type of movement associated with the channel-frequency features [[User Tutorial:Analyzing the Initial Mu Rhythm Session\|chosen for feedback]]. In our example, since the largest r-squared value was associated with "right hand vs. rest", when the target is on the '''bottom edge''', move right hand; when the target is on the '''top edge''', stay rest.

			In the first feedback Session, the motion of the cursor might not follow the behavior of the subject. This is because the ''Adaptaion'' mode is on. In '''Filtering''' tab, ''Adaptation'' box contains two numbers <tt>0 2</tt>. As our example involves only one dimensional control, the horizontal component is <tt>0</tt>. By having <tt>2</tt> on the vertial component, the linear classifier will "learn" the best coeficient to distinguish the difference of mu power between "right hand" and "rest". When the first session, or the "learning session" ended, one can set the vertical component to <tt>0</tt>, and subject can then try to gain control on the cursor.

	Explicitly specifying a type of imagination to control cursor movement will help the subject achieve initial cursor control. Once the subject has become more proficient with the task, motor imagery typically becomes less important. In this situation, it is not uncommon that subjects report that they just "imagine to move the cursor."		Explicitly specifying a type of imagination to control cursor movement will help the subject achieve initial cursor control. Once the subject has become more proficient with the task, motor imagery typically becomes less important. In this situation, it is not uncommon that subjects report that they just "imagine to move the cursor."
Line 27:		Line 29:
	*Contraction of the muscles of the face/head, swallowing;		*Contraction of the muscles of the face/head, swallowing;
	*Eye blinks and eye movements;		*Eye blinks and eye movements;
	*Motion.		*Motion during the "rest" phase.

	Provided that subjects are asked to minimize artifacts, he/she should be further		Provided that subjects are asked to minimize artifacts, he/she should be further

Ckong: /* Instructions to the Subject */

2019-07-25T16:51:40Z

Instructions to the Subject

← Older revision		Revision as of 16:51, 25 July 2019
Line 11:		Line 11:
	When the subject is ready for EEG acquisition, it is time to brief the subject about the experimental task. Suggested instructions to the experimenter and subject are listed below.		When the subject is ready for EEG acquisition, it is time to brief the subject about the experimental task. Suggested instructions to the experimenter and subject are listed below.

	A screen with a ~~yellow grid~~ is initially presented. As soon as the subject is		A screen with a black background is initially presented. As soon as the subject is
	ready and the EEG traces are stabilized, the investigator will start the		ready and the EEG traces are stabilized, the investigator will start the
	acquisition. For each trial, four phases will occur:		acquisition. For each trial, four phases will occur:
	#Target presentation. A target appears on the ~~right~~ edge of the screen for about ~~one~~ second.		#Target presentation. A target appears on the edge of the screen for about 10 second.
	#Cursor movement. A cursor appears on the ~~left edge~~ of the screen, and begins to move ~~horizontally~~ towards the ~~right~~ edge of the screen. Its ~~vertical~~ position is controlled by the EEG features that were defined in the previous step. The subject's task is to ~~move the cursor vertically so that it hits~~ the ~~target when the cursor hits the right edge~~ of ~~the screen. The time needed for~~ the cursor ~~to move from the left to the right edge of the screen should last approximately three seconds~~.		#Cursor movement. A cursor appears on the middle of the screen, and begins to move vertically towards the edge of the screen. Its position is controlled by the EEG features that were defined in the previous step. The subject's task is to engage in respective hand or feet movement based on the location of the cursor.
	#Result. If the subject successfully hits the target, the target changes its color. Otherwise, no change occurs. In either case, this period lasts one second.		#Result. If the subject successfully hits the target, the target changes its color. Otherwise, no change occurs. In either case, this period lasts one second.
	#Intertrial Interval. The screen will then turn black for one second. This indicates the end of the trial. After this one-second period, the next trial starts.		#Intertrial Interval. The screen will then turn black for one second. This indicates the end of the trial. After this one-second period, the next trial starts.

	When a target is presented, the subject should ~~imagine~~ the type of movement associated with the channel-frequency features [[User Tutorial:Analyzing the Initial Mu Rhythm Session\|chosen for feedback]]. ~~For~~ example, ~~when~~ the largest r-squared value was associated with ~~left~~ hand ~~movement imagination in the offline analysis~~, ~~ask~~ the ~~subject to use this imagination to control~~ the ~~direction of cursor movement. Imagined movement will~~ move the ~~cursor upward~~ on the ~~screen~~, ~~and relaxing will move it downward~~.		When a target is presented, the subject should engage the type of movement associated with the channel-frequency features [[User Tutorial:Analyzing the Initial Mu Rhythm Session\|chosen for feedback]]. In our example, since the largest r-squared value was associated with "right hand vs. rest", when the target is on the '''bottom edge''', move right hand; when the target is on the '''top edge''', stay rest.

	Explicitly specifying a type of imagination to control cursor movement will help the subject achieve initial cursor control. Once the subject has become more proficient with the task, motor imagery typically becomes less important. In this situation, it is not uncommon that subjects report that they just "imagine to move the cursor."		Explicitly specifying a type of imagination to control cursor movement will help the subject achieve initial cursor control. Once the subject has become more proficient with the task, motor imagery typically becomes less important. In this situation, it is not uncommon that subjects report that they just "imagine to move the cursor."

Mellinger: /* Instructions to the Subject */

2009-08-18T13:57:31Z

Instructions to the Subject

← Older revision		Revision as of 13:57, 18 August 2009
Line 11:		Line 11:
	When the subject is ready for EEG acquisition, it is time to brief the subject about the experimental task. Suggested instructions to the experimenter and subject are listed below.		When the subject is ready for EEG acquisition, it is time to brief the subject about the experimental task. Suggested instructions to the experimenter and subject are listed below.

	A screen with a ~~T in the center~~ is initially presented. As soon as the subject is		A screen with a yellow grid is initially presented. As soon as the subject is
	ready and the EEG traces are stabilized, the investigator will start the		ready and the EEG traces are stabilized, the investigator will start the
	acquisition~~, and the T will disappear~~. For each trial, four phases will occur:		acquisition. For each trial, four phases will occur:
	#Target presentation. A target appears on the right edge of the screen for about one second.		#Target presentation. A target appears on the right edge of the screen for about one second.
	#Cursor movement. A cursor appears on the left edge of the screen, and begins to move horizontally towards the right edge of the screen. Its vertical position is controlled by the EEG features that were defined in the previous step. The subject's task is to move the cursor vertically so that it hits the target when the cursor hits the right edge of the screen. The time needed for the cursor to move from the left to the right edge of the screen should last approximately three seconds.		#Cursor movement. A cursor appears on the left edge of the screen, and begins to move horizontally towards the right edge of the screen. Its vertical position is controlled by the EEG features that were defined in the previous step. The subject's task is to move the cursor vertically so that it hits the target when the cursor hits the right edge of the screen. The time needed for the cursor to move from the left to the right edge of the screen should last approximately three seconds.

Mellinger: /* Monitoring the Recording */

2009-06-02T13:38:22Z

Monitoring the Recording

← Older revision		Revision as of 13:38, 2 June 2009
Line 46:		Line 46:
	tasks during the experiment:		tasks during the experiment:
	*Filling in a run-sheet to report information that is not automatically recorded by BCI2000 and that will later help when data are analyzed (e.g., subject did not seem to understand the instructions in the first run, instructions to the subject for a particular run, etc.).		*Filling in a run-sheet to report information that is not automatically recorded by BCI2000 and that will later help when data are analyzed (e.g., subject did not seem to understand the instructions in the first run, instructions to the subject for a particular run, etc.).
	*Monitoring the EEG ~~waves~~ to verify the quality of the recording (e.g., no electrode contact failure, muscular, ocular, or motion artifacts, etc.)		*Monitoring the EEG signal to verify the quality of the recording (e.g., no electrode contact failure, muscular, ocular, or motion artifacts, etc.)
	*Reinforce the subject: notify the subject if he/she is producing artifacts, keep the subject alert if getting drowsy, give the subject feedback about his/her performance so that interest, alertness, and attention is kept high.		*Reinforce the subject: notify the subject if he/she is producing artifacts, keep the subject alert if getting drowsy, give the subject feedback about his/her performance so that interest, alertness, and attention is kept high.
	The run sheet is the most important means of communication between the		The run sheet is the most important means of communication between the