Actually, single layer/later free networks can learn XOR under naturally occurring modulated learning conditions[1]. I am the author and was able to demonstrat

Actually, single layer/later free networks can learn XOR under naturally occurring modulated learning conditions[1]. I am the author and was able to demonstrate 6-dimensional XOR learned in a Hopfield network using Hebbian learning. [1] https://drive.google.com/file/d/1R4mS_4vzf5mycQez76O_mmpQDpT3DiZz/view?usp=drivesdk https://drive.google.com/file/d/1R4mS_4vzf5mycQez76O_mmpQDpT... (PDF)