Cross-Modal Plasticity Results in Increased Inhibition in Primary Auditory Cortical Areas

Figure 6

An example of an XMAC neuron’s responses to bisensory stimuli summed over 5 trials, before and after blocking inhibition. (a) Before gabazine application, this neuron responded to auditory but not to optic chiasm stimulation. (b) After gabazine application, it responded to both auditory and optic chiasm stimulation. (c) The mean spikes per trial before blockade of inhibition. (d) The mean spikes per trial after blockade of inhibition. Neither facilitation nor depression was found when auditory and optic chiasm stimulation (AOX) were given simultaneously. Note that the neuron began to respond to OX stimulation only after blockade of inhibition. A indicates auditory stimuli. OX indicates optic chiasm stimulation.