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Licking spout. (A) Spout with electronic equipment (“lick sensor”) containing amplifier, high pass filter, and threshold detector. The spout consists of (1) the metallic part of a venous catheter, (2) a piezo element (green) glued to the spout using epoxy glue, the connector to the water tube (3), and the cable carrying the piezo output (4). (B) Analog piezo output (red, arbitrary units) and licking events detected by a simple threshold algorithm (black).
