In reality, neurons aren't simply nodes, but instead there is a large diversity of neuron types (with different behaviors), and computation is performed within the neuron cell bodies, within the axons, and within the dendrites , Neurons don't communicate just through electrical signals either--around 10 common neurotransmitters and 200 uncommon neuromodulators are implicated in neuronal interaction, and neurons can even communicate without direct synaptic communication, such as via ephaptic
coupling (nerve fiber coupling via local electric fields) and via chemical diffusion in the extracellular space  .
Anastassiou CA, Perin R, Markram H, Koch C  Ephaptic
coupling of cortical neurons.
Hemifacial spasm: ephaptic
transmission or hyperexcitability of the facial motor nucleus?
The theory of ephaptic transmission seems to be a very appealing explanatory pathophysiologic mechanism of low back pain and radicular symptomatology in these patients.
Ephaptic transmission in chronically damaged peripheral nerves.
A recent hypothesis based on evidence from carp retina holds that currents through Cx26 hemichannels on horizontal cell dendritic processes serve to modulate calcium currents and related photoreceptor transmitter release via an ephaptic
current within the synaptic region.
25] Transaxonal ephaptic
transmission may explain the spinal origin of these sensorimotor seizures.