Some stimuli are physical variations in the environment that affect receptor cell membrane potentials. The difference in voltage between electrode potentials gives a prediction for the potential measured. EEG reflects correlated synaptic activity caused by post-synaptic potentials of cortical neurons. Neurons can generate rhythmic patterns of action potentials or spikes. Development is the outer realization of latent inner potentials. These are depolarising oscillations in the membrane voltage induced by preceding action potentials. Scalp EEG is sensitive to extracellular volume currents produced by postsynaptic potentials. Neurologic muscle tone is a manifestation of periodic action potentials from motor neurons. Analogous procedures exist for the minimization of other thermodynamic potentials. Take, for example, the equilibrium potentials of potassium and sodium in neurons. The particles are then collected on electrodes at various large electrical potentials. The forces between the atoms are characterized by isotropic continuum electrostatic potentials. These nodes are areas where action potentials can be generated. AMPA generates fast excitatory postsynaptic potentials (EPSP). Bioplastics induce higher eutrophication potentials than conventional plastics.