- In cortex: 20%
- Hendry, S. H., and Jones, E. G. (1981). Sizes and distributions of intrinsic neurons incorporating tritiated GABA in monkey sensory-motor cortex. J. Neurosci., 1(4), 390–408.
- Gabbott, P. L., and Somogyi, P. (1986). Quantitative distribution of GABA-immunoreactive neurons in the visual cortex (area 17) of the cat. Exp. Brain Res., 61(2), 323–331.
- Parisien, C., Anderson, C.H., Eliasmith, C. (2008). Solving the problem of negative synaptic weights in cortical models. Neural Computation. 20, 1473-1494.
The transformation introduces a population of either 50 or 75 fast-spiking (FS) inhibitory interneurons, to match the 20% proportion found in cortex (Hendry and Jones, 1981; Gabbott and Somogyi, 1986).