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Nevertheless, there is no paradox, for a quite real physical device - an
inverting voltage follower by an operational amplifier (op amp) also
possesses these properties maintaining a constant (zero) voltage at the
inverting input (2) of the op
amp. For operating this way, the feedback loop has to possess practically
“infinite” gain.
A similar circuit with two inputs enclosed in a common feedback loop,
illustrates the mechanism of opponent interaction between channels.
Stimulation of one input (say, L1) evokes a response of the same sign at the appropriate output (L2) and a response of the opposite sign at the adjacent output (R2). Stimulation of both inputs does not evoke any steady-state responses at all. In the feedback loop (3) the signals are simply summarized.