The position of these five fiducial points are also known from the MNI template, so that OxySoft performs the coregistration automatically, i.e. Note that we of course record and correct for movement of the participant simultaneously using a dedicated head motion sensor. Note that using five points allow for a more precise coregistration, and thus more accurate results than used in most articles, and is far superior to the common 4-point registration (see also, and ). the nasion (the valley on your nasal bone), the inion (the small bulge on the back of your head), the two pre-auricular points (just in front of your ears) and the vertex, which is the crossing point of the nasion-inion line and the left and right pre-auricular points. OxySoft will ask for five fiducial points. The fiducials are anatomical landmarks, which are used to infer the size and shape of the participant’s head. Of course, OxySoft will automatically coregister the digitized points to the MNI-152 template, allowing you without any effort to report back the actual positions of the optodes in MNI-space.Īfter having established a connection with the Polhemus digitizer, OxySoft will initially ask to digitize fiducial points. OxySoft is the only fNIRS recording software which has this direct interface between fNIRS optode template (also called probe setup) and actual positions of the optodes with respect to the participant’s head. Upon clicking on the button on the stylus, OxySoft gets notified to record the momentarily position. While similar in shape as a pen, it is connected to the Polhemus device. The tool of choice for digitizing is the stylus. OxySoft uses these 3D coordinates to localize the positon of the optodes with respect to the participant’s head. The Polhemus digitizer measures the position of sensors in a self-created 3D electromagnetic field. and ), but have for example also been used to digitally archive Star Wars artifacts or during filming of the Lord of the Rings movies ( ). Polhemus is established as the world’s leading digitization and motion tracking company, which devices are not only used extensively in neuroscience research (see e.g. OxySoft supports the digitizers from Polhemus Inc. For more information on the brain templates, see. Using this template, you are thus using a brain that is compatible with the vast majority of neuroscientists worldwide. This is also the brain template that is implemented in OxySoft. This the most used brain template in neuroscience research, especially in the fMRI community. The International Consortium for Brain Mapping (ICBM) has adopted the MNI-152 brain template as their standard template. The Montreal Neurological Institute (MNI) has created one of these templates, the MNI-152. Thereby the location of a specific brain region is precisely known, if it is already known from the brain template. As every individual head and brain is different, researchers have agreed to use so-called standard brain templates, to which the individual anatomy and functional data is transformed to.
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