Can record single action potentials, with careful discetion even small c-fibres. Intracellular record AP with good fidelity, see absolute potential of AP, epsp, ipsp. Excellent amplitude and temporal resolution, but can only look at very small number of cells at once. Even with this resolution, it took chemical techniques to show that axon hillock does not exists in neurons. Nervous system more than single synapse.
Most cells have many inputs, integrated over cell surface and over time.
Look at integration of synaptic inputs over cell surface. Divergence easy but convergence may underlay processing. Our interest in sensory encoding. Mechanosensors converge, integration of inputs from individual end organs. Is there an analogue of the axon hillock.