Abstract: A subject is connected to a monitoring system and videoed while being monitored. The monitoring system receives raw data from the subject and processes the raw data into waveform data, and transmits the waveform data to a marking device. The marking device simultaneously marks the waveform data with a waveform reference point and causes a light emitting diode to flash in the video, thereby creating a video reference point. A computer program locks the waveform reference point with the video reference point and thereby synchronizes the waveform data with the video.

Abstract: An electrical penetration graph (EPG) system includes a monitoring device with a buffered and stabilized voltage source assembly and a buffered internal amplifier with switched gain control. The system also includes a head stage amplifier. During the EPG process, the voltage source assembly directs an electrical current through a feeding insect. As the current passes through the insect, the insect's feeding process modulates the current and creates voltage waveform data. A head stage amplifier with selectable input resistance receives and amplifies the voltage waveform data. The data is transmitted back to the monitoring device where it is manipulated and further amplified by the monitoring device internal amplifier assembly. The waveform data is then transmitted to a controller and ultimately to an output device where the data is displayed.