[Changes in cortical neuron input resistance and the stimulation threshold of its electroexcitable membrane by a depolarizing current during the habituation process].

The habituation of neurones in the turtle visual cortex is accompanied by changes in their input resistance and in the threshold of stimulation of their electro-excitable membrane by depolarizing current. Input resistance of the neurone during monotoneous stimulation decreases throughout habituation and increases following an alien stimulus. The threshold becomes higher if the current acts as a monotoneous stimulus and gets lower if it acts as an alien stimulus. Input resistance of a habituated neurone and its threshold are restored after alien stimulation and spontaneously--after interruption. These changes are specific to the stimulation, appear during its action, and are reversible. They form postsynaptic mechanisms of habituation.