(a) Excitatory (red) and inhibitory (blue) synaptic currents onto a random selection of Pyr neurons, as a function of temporal and spatial stimulus frequency (averaged over all orientations), when both incoming and outgoing parvalbumin-expressing (PV) synapses are plastic. (b) The network-averaged excitatory (first row) and inhibitory (second row) synaptic currents onto Pyr neurons, both centred according to the peak excitatory current before averaging. After averaging, their difference is taken (third row) and a slice is plotted (bottom row). When both plasticities are present, currents are well balanced across stimuli with a modest excitatory bias for preferred stimuli. (c) Quality of excitatory-inhibitory (E-I) current co-tuning for every Pyr in the network quantified by the distribution of their cosine similarities. Only when both plasticities are present, do most Pyr neurons receive well co-tuned E-I synaptic currents.