Surely you are trolling me now. There is a very clear biological inspiration mentioned in this paper: they literally define a CNN as having “receptive fields” and then they cite the same Hubel & Wiesel research mentioned before multiple times. LeCun mentions their research in papers even earlier in the 80s as well, during which they were awarded the Nobel prize for their research on the visual system. Of course there is also a lot of computational and mathematical research that was ongoing simultaneously, but to say that there is “no inspiration whatsoever” is pretty far from the truth.