Narrow-band simple cells
Robson, J.G., Tolhurst, D.J., Freeman, R.D., and Ohzawa, I. (1988)
Simple cells in the visual cortex of the cat can be narrowly tuned for spatial frequency.
Visual Neurosci. 1: 415-419.
The existence in cat cortex of linearly operating simple cells with relative
spatial-frequency bandwidths of between 0.5 and 1 octave is confirmed.