This relationship is a direct application of Ohm's Law (V = I * R) to neuronal membrane physics, where a higher input resistance (R) results in a larger voltage change (V) for a given injected current (I), and no empirical citation is needed.
The claim is a restatement of Ohm's fundamental electrical law as applied to neuronal membranes (V = I * R). By definition, voltage change equals current multiplied by resistance, making this a matter of basic physics and common knowledge rather than an empirical hypothesis requiring citation.