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. 2014 Aug 12;4:6039. doi: 10.1038/srep06039

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(a) Schematic of system where NOP is subjected to external periodic signal. (b) Evolution of population with and without external input. (c) Synchronization of NOP to external input radiation. The bandwidth of the frequency locking increases with the amplitude of the external input. (d) Analysis of sensitivity of synchronization. Synchronization of weakly excited NOP is more sensitive to external input.