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Solitary electromechanical pulses in Lobster neurons | | Alfredo Gonzalez-Perez
; Lars D. Mosgaard
; Rima Budvytyte
; Edgar Villagran-Vargas
; Andrew D. Jackson
; Thomas Heimburg
; | | Date: |
25 Feb 2015 | | Abstract: | Investigations of nerve activity have focused predominantly on electrical
phenomena. Nerves, however, are thermodynamic systems, and changes in
temperature and in the dimensions of the nerve can also be observed during the
action potential. Measurements of heat changes during the action potential
suggest that the nerve pulse shares many characteristics with an adiabatic
pulse. In the past, experiments by Iwasa & Tasaki demonstrated small changes in
nerve thickness and length during the action potential. Such findings have led
to the suggestion that the action potential may be related to electromechanical
solitons traveling without dissipation. Here, we present ultrasensitive AFM
recordings of mechanical changes on the order of 0.2 - 1.2 nm in the giant
axons of the lobster. When stimulated at opposite ends of the same axon,
colliding action potentials pass through one another and do not annihilate.
These observations are consistent with a mechanical interpretation of the
nervous impulse. | | Source: | arXiv, 1502.7166 | | Services: | Forum | Review | PDF | Favorites | |
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