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At a particular hierarchical level, we enumerate [[neurons]] by index n=1,2..N. These [[neurons]] receive input, [[bottom-up signals (bottom-up neural signals)|bottom-up signals]],
'''X(n)''', from lower levels in the processing hierarchy. '''X'''(n) is a field of bottom-up neuronal [[synapse | synaptic]] activations, coming from [[neurons]] at a lower level. Each [[neuron]] has a number of [[synapses]]; for generality, we describe each neuron activation as a set of numbers, '''X'''(n) = {X<sub>d</sub>(n), d = 1,... D}.
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