Beauchamp:TMSOverview: Difference between revisions
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== General Overview == | == General Overview == | ||
Like with any other experiment you first need to design the experiment and determine what conditions you will be testing and how many repetitions and how many subjects, etc. Additionally for ALL TMS experiments you will need to have one or more "control" experiments. This is to rule out that the observed effect is due to non-specific effect of the TMS. It is best to have at least one "spatial" and one "temporal" control experiment. With the spatial control, you will move the coil to a different location on the brain. Some people move the coil away from the head or tilt it. I don't think that would be a good control. For a temporal control, you need to try different timings of TMS with respect to the stimulus. If the observed effect is a genuine neural effect, it has to be extremely dependent | Like with any other experiment you first need to design the experiment and determine what conditions you will be testing and how many repetitions and how many subjects, etc. Additionally for ALL TMS experiments you will need to have one or more "control" experiments. This is to rule out that the observed effect is due to non-specific effect of the TMS. It is best to have at least one "spatial" and one "temporal" control experiment. With the spatial control, you will move the coil to a different location on the brain. Some people move the coil away from the head or tilt it. I don't think that would be a good control. For a temporal control, you need to try different timings of TMS with respect to the stimulus. If the observed effect is a genuine neural effect, it has to be extremely dependent on the timing of TMS. | ||
== Presenting the stimuli and TMS == | == Presenting the stimuli and TMS == | ||
Revision as of 12:50, 21 April 2011
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Beauchamp Lab
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General Overview
Like with any other experiment you first need to design the experiment and determine what conditions you will be testing and how many repetitions and how many subjects, etc. Additionally for ALL TMS experiments you will need to have one or more "control" experiments. This is to rule out that the observed effect is due to non-specific effect of the TMS. It is best to have at least one "spatial" and one "temporal" control experiment. With the spatial control, you will move the coil to a different location on the brain. Some people move the coil away from the head or tilt it. I don't think that would be a good control. For a temporal control, you need to try different timings of TMS with respect to the stimulus. If the observed effect is a genuine neural effect, it has to be extremely dependent on the timing of TMS.
Presenting the stimuli and TMS
You will need to write a program to deliver the stimuli and TMS with precise control of timing of the stimuli. "Presentation" program (www.nuerobs.com) is a relatively good and easy software for this purpose. Computer control of TMS machine is explained here: http://openwetware.org/wiki/Beauchamp:TMS#Computer_control_of_TMS_machines
1- Make sure the reflective markers holder is tightly fixed to the coil and calibrate the coil. (This doesn't need to be done every time if the markers have not moved)
2- Create a new project and load the anatomical images (NifTi file).
3- (Optional) Load functional images as well if available/needed. Note that some preprocessing is needed to make the functional images have the same resolution as the anatomical. See: http://openwetware.org/wiki/Beauchamp:TMS#Transferring_MRI_Data_To_The_Brainsight_System
4- Generate 3D brain (Full Brain Curvilinear) and skin reconstructions.
5- Mark anatomical landmarks. A minimum of three is needed. Four would be better: Nose Tip, Nasion, left and right ear notches.
6- Identify and mark targets based on the anatomy and/or functional map.
7-Do the experiment!
Extra: You can record the exact coordinates of each TMS pulse using the LabJack interface.
