Multi-unit operation in the single neuron

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Noise current stimulations were applied to rat hippocampal CA1 pyramidal cell dendrite in the acute and measured a membrane potential by Whole-cell Patch clamp. As a result of frequency response analysis, the dendrites had the characteristic of the low pass filter. In addition, heterogeneous distributions of the electrical impedance were shown on the dendrites, and there were the highest value in the intermediate segment of the dendrite. My results suggest that apical dendrites of hippocampal CA1 pyramidal cells integrate synaptic inputs, according to the frequency components of the input signal, along the dendritic segments receiving the inputs.