During the teaching phase, back propagation of {HEAD ~ the weights} using a gradient decent method that includes the local feedback and {TAIL ~ the crosstalk} can be performed 
During the teaching phase , back propagation of { HEAD ~ the weights } using a gradient decent method that includes the local feedback and { TAIL ~ the crosstalk } can be performed
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH