Synchronized video coupled to simultaneously recorded physiological variables can help lead to better understanding of test results. AcqKnowledge 4.1 or above for Windows provides the ability to record a video signal which can be simultaneously collected with other types of time-series data, such as biopotential data (ECG, EEG, EMG, or EOG) or transducer data (electrodermal activity, force, pressure, temperature, accelerometer, goniometer, strain, etc.).
The key issue when performing simultaneous recording of physiological data and video data is synchronization. Because the video camera and associated digitizer are separate devices from the MP unit, the data from the video digitizer is only combined with data from the MP unit as they arrive to the AcqKnowledge application running on the computer.
This application note details the required hardware and software setup to time-synchronize two data streams, one from an MP data acquisition unit and the other from a video digitizer, such as a BIOPAC Multi-Camera System or High Frame Rate Camera System.
With this setup, it’s typically possible to obtain synchronization between physiological data and video data to within ±1 video frame (33.3 ms) over a one-hour period.
Electrodermal Activity (EDA) is an objective index for understanding emotional states. Researchers measure EDA to gain insights on psychological or physiological response, leading them down the path of scientific discovery. Because EDA is so important to research, BIOPAC has created tools to optimize event-related EDA analysis. Topics include: how to identify skin conductance responses, convert stim events from E-Prime SuperLab, Presentation, Vizard, etc., into AcqKnowledge events that can used for analysis, and score skin conductance responses using the AcqKnowledge automated EDA analysis tool.
NIRS and CNAP—Pairing great tools for great data Cerebral hemoglobin concentration (blood mass in the brain) is frequently measured in the prefrontal cortex, and systemic arterial blood pressure is known to be a variable factor based on the hemoglobin concentration. A leg pressure cuff was used to constrict and release blood flow to create a […]
BIOPAC’s just released Introductory ECG Guide addresses fundamental to advanced concerns to optimize electrocardiography data recording and analysis. Topics include: ECG Complex; Electrical and Mechanical Sequence of a Heartbeat; Systole and Diastole; Configurations for Lead I, Lead II, Lead III, 6-lead ECG, 12-lead ECG, precordial leads; Ventricular Late Potentials (VLPs); ECG Measurement Tools; Automated Analysis Routines […]