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Schematic drawing of a direct-current electrical penetration graph (DC-EPG)-based behavioral analysis system. This EPG system turns a phloem-sucking insect and its host plant into part of an electrical circuit that is completed when the insect's mouthparts penetrate the plant. The electrical signal is amplified by an amplifier and digitized by a converter. Fluctuations in voltage and electrical resistance are recorded and can be matched to specific feeding events.
