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lüll Beyond the wiring diagram: signalling through complex neuromodulator networks Brezina VPhilos Trans R Soc Lond B Biol Sci 2010[Aug]; 365 (1551): 2363-74During the computations performed by the nervous system, its 'wiring diagram'--the map of its neurons and synaptic connections--is dynamically modified and supplemented by multiple actions of neuromodulators that can be so complex that they can be thought of as constituting a biochemical network that combines with the neuronal network to perform the computation. Thus, the neuronal wiring diagram alone is not sufficient to specify, and permit us to understand, the computation that underlies behaviour. Here I review how such modulatory networks operate, the problems that their existence poses for the experimental study and conceptual understanding of the computations performed by the nervous system, and how these problems may perhaps be solved and the computations understood by considering the structural and functional 'logic' of the modulatory networks.|Animals[MESH]|Muscles/*physiology[MESH]|Nerve Net/*physiology[MESH]|Neurotransmitter Agents/*physiology[MESH]|Signal Transduction/*physiology[MESH] |