HOW A PHYSICIST SEES BIOLOGY. “Thus, in order to imitate gravity‐like connections among the neurons, we shall make the synaptic connection among the two neurons k and r negative (excitatory) and moreover proportional to the product of their threshold energies.”
https://onlinelibrary.wiley.com/doi/full/10.1002/prop.201800007?casa_token=GdPRXs_tGLEAAAAA%3Ag-pxPMtkcleTYDUNK3mYGfpEzKRyc2LqQknTgFFB7dkYFDL8rDe2s0f4_0Q0oKjXD4_AEgFPGWolVTQ