scholarly journals Contactless measurements of retinal activity using optically pumped magnetometers

NeuroImage ◽  
2021 ◽  
pp. 118528
Author(s):  
Britta U. Westner ◽  
James I. Lubell ◽  
Mads Jensen ◽  
Sigbjørn Hokland ◽  
Sarang S. Dalal
Keyword(s):  
Optically Pumped ◽  
Retinal Activity ◽  
Contactless Measurements

scholarly journals Contactless recordings of retinal activity using optically pumped magnetometers

2021 ◽  
Author(s):  
Britta U. Westner ◽  
James I. Lubell ◽  
Mads Jensen ◽  
Sigbjørn Hokland ◽  
Sarang S. Dalal
Keyword(s):  
Evoked Potentials ◽  
Brain Activity ◽  
Cryogenic Temperatures ◽  
Optically Pumped ◽  
Retinal Activity ◽  
Amount Of Information ◽  
Flash Stimulation

Optically pumped magnetometers (OPMs) have been adopted for the recording of brain activity. Without the need to be cooled to cryogenic temperatures, an array of these sensors can be placed more flexibly, which allows for the recording of neuronal structures other than neocortex. Here we use eight OPM sensors to record human retinal activity following flash stimulation. We compare this magnetoretinographic (MRG) activity to the simultaneously recorded electroretinogram of the eight participants. The MRG shows the familiar flash-evoked potentials (a-wave and b-wave) and shares a highly significant amount of information with the electroretinogram recording (both in a simultaneous and separate recording). We conclude that OPM sensors have the potential to become a contactless alternative to fiber electrodes for the recording of retinal activity. Such a contactless solution can benefit both clinical and neuroscientific settings.

RF energy coupling to high-pressure optically pumped nonequilibrium plasmas

2001 ◽  
Author(s):  
Peter Palm ◽  
Elke Plonjes ◽  
Wonchul Lee ◽  
Kraig Frederickson ◽  
Walter Lempert ◽  
...  
Keyword(s):  
High Pressure ◽  
Energy Coupling ◽  
Optically Pumped ◽  
Nonequilibrium Plasmas ◽  
Rf Energy

Spikes in raman spectrum of miniature optically pumped NH3 fir laser

1996 ◽  
Vol 17 (6) ◽  
pp. 1055-1062 ◽  
Author(s):  
Jiayin Qin ◽  
Xingshi Zheng ◽  
Xizhang Luo ◽  
Cong Li ◽  
Yikun Lin
Keyword(s):  
Raman Spectrum ◽  
Fir Laser ◽  
Optically Pumped

scholarly journals Action potentials induce biomagnetic fields in carnivorous Venus flytrap plants

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Anne Fabricant ◽  
Geoffrey Z. Iwata ◽  
Sönke Scherzer ◽  
Lykourgos Bougas ◽  
Katharina Rolfs ◽  
...  
Keyword(s):  
Electrical Activity ◽  
Action Potentials ◽  
Plant Stress ◽  
Optically Pumped ◽  
Long Distance ◽  
Noninvasive Diagnostics ◽  
Venus Flytrap ◽  
Dionaea Muscipula ◽  
Cell Arrays ◽  
Electrical Signaling

AbstractUpon stimulation, plants elicit electrical signals that can travel within a cellular network analogous to the animal nervous system. It is well-known that in the human brain, voltage changes in certain regions result from concerted electrical activity which, in the form of action potentials (APs), travels within nerve-cell arrays. Electro- and magnetophysiological techniques like electroencephalography, magnetoencephalography, and magnetic resonance imaging are used to record this activity and to diagnose disorders. Here we demonstrate that APs in a multicellular plant system produce measurable magnetic fields. Using atomic optically pumped magnetometers, biomagnetism associated with electrical activity in the carnivorous Venus flytrap, Dionaea muscipula, was recorded. Action potentials were induced by heat stimulation and detected both electrically and magnetically. Furthermore, the thermal properties of ion channels underlying the AP were studied. Beyond proof of principle, our findings pave the way to understanding the molecular basis of biomagnetism in living plants. In the future, magnetometry may be used to study long-distance electrical signaling in a variety of plant species, and to develop noninvasive diagnostics of plant stress and disease.

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