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 PRINT-FRIENDLY PDF Head mounted displays (HMD) are often utilized in virtual reality protocols. Measures such as fNIRS, EEG, and Cognitive State are also useful, and sensors for such measurements must…

For current release software, check the COMPATIBILITY table. For older software versions, the Release History specifies which operating systems were used for testing software prior to release.

The amplitude of a skin conductance response (SCR) is typically defined as the peak height of the tonic skin conductance level minus the value of the tonic skin conductance level…

Since version 4.1 of AcqKnowledge, there has been a preference setting that allows the software to “Always work with no hardware connected”. If the Start button is disabled when you…

There are many possible reasons for a flat signal. It is important to make a distinction between the data (the numbers that the computer is actually recording) and the display…

Transducers developed by BIOPAC are linear over their expected ranges of operation. Therefore, knowing the system’s response to two physical stimuli is all that is required. In many cases the…

For comments on some specific data types, see “How do I calibrate my data (Hardware)?” To calibrate a transducer before data are acquired: From the perspective of software, the key…

BIOPAC Systems are intended to be modular, so there is a lot of freedom to connect different components together in different ways. In general, any way modules can fit together…

There are three areas of concern that must be considered in deciding the best way to synchronize stimulation/recording. Experimental need—the precision with which the timing of stimulus delivery events must…

For most biopotential recordings, it is important to provide a low impedance contact with the tissue underneath the skin at the electrode site. Consequently skin should be abraded with pumice,…

The single fibers can be cut to length using a sharp razor blade. The cut should be made at a 90 degree angle to the length of the fiber.

First, note that HRV is always calculated. It is not measured. It is not a physical quantity. While these statements are also true of any computation of heart rate (see…

IIR filters IIR filters are much more efficient than FIR filters, but can introduce linear phase distortions. The IIR filters in BIOPAC hardware are emulated by the software IIR filters.…

MP Systems can interface with most of the major visual presentation packages by using the STP100C module. The STP100C module provides an optically isolated connection between the computer that is…

If you have an existing amplifier or other piece of equipment that provides an analog signal in the ±10 volt range, you can connect the signal directly to the UIM100C by…

To invert a waveform: Select “Transform > Waveform Math…”. Source 1 should be the channel to be inverted, the operation should be “*”, Source 2 should be K (constant), and the Destination should…

Changes to channel setup do not appear in the graph window until new data are acquired. To verify that changes have taken effect, click the “Start” button in AcqKnowledge (this…

All biopotential recordings can suffer from 50/60Hz interference.  The largest contributors to problems are mains ground wiring and florescent fixtures. For lighting we would recommend incandescent fixtures, perhaps low voltage…

It is possible to use LabView® with the either the MP150, MP36* or MP35 hardware. The BIOPAC Hardware API gives software developers control over the BIOPAC acquisition unit – MP150…

To load Physiobank data files into AcqKnowledge 3.9 or higher for Mac, or 4.0 or higher for Windows: Locate the record of interest at the Physiobank database: http://www.physionet.org/physiobank/database/  Download four…

How to eliminate artifacts caused by magnetic stimulation (do not confuse with MRI artifacts): The magnetic stimulator could induce a current to flow in the (for example) EMG leads.  A…

If you are using a single MP100/MP150 system, the maximum number of EEG amplifiers you can have is 16.  If more channels are required, it is possible to link acquisitions from…

Running a 0.5 Hz low pass FIR filter on the raw impedance wave will result in a measure of respiration. Reference Ernst, J. M., Litvack, D. A., Lozano, D. L., Cacioppo,…

If the Biopac Student Lab Startup Wizard window does not list lessons in the “Choose a Lesson” window, and if the software did NOT generate an error message indicating that it could…

BIOPAC Research Systems were updated from MP150/UIM to MP160/HLT in August 2016 Sophisticated solutions for data acquisition and analysis Each MP System (MP100 or MP150) is a complete and expandable…

Click to review MP150 Firmware Compatibility requirements by AcqKnowledge release and computer OS.

If you want to use a fixed IP address when connecting directly with the MP150 system via a crossover cable and using the UDP protocol, you should use the following address…

The Biopac Student Lab MP3X data acquisition unit uses adjustable hardware filters, fixed hardware filter, anti-aliasing filter, and adjustable digital filters. Filters are applied in the following sequence: Additional filtering…

Sample rates for physiological signals acquired by the MP40 Biopac Science Lab system:   ECG 1000 EMG 1000 EOG 250 EEG 250 RESPIRATION 500  

MRI “triggering” operates to drive a digital channel of data. This data is collected along with other physiological signals. There are two ways to trigger the MRI. For the greatest…

Physiological noise correction tool for fMRI data PhysIO Toolbox to remove image artifact associated with RSP and ECG The general purpose of the PhysIO Toolbox is the model-based physiological noise correction…

BIOPAC offers a series of magnetic resonance imaging compatible electrodes, electrode leads, transducers, and stimulus options for safe data acquisition of physiological signals in the MRI environment. Specialized cable systems…

BIOPAC definitions Items have been tested with a 7T Siemens MAGNETOM, with SC72 gradient set, a maximum gradient amplitude of 70 mT/m, and a slew rate of 200 mT/m/ms. Tested…

  Shown are six independent, and synchronized, MP160 systems collecting up to 16 channels each, monitored via remote central station. Extensible to thousands of channels. #dataacquisition #physiology #lifescience #extensible #remotemonitoring…

      For detailed correlation of standards and lessons, see National Science Education Standards Correlation

Tonic skin conductance levels can never be negative.  Possible reasons for observing negative values (negative conductance) for an EDA (GSR/skin conductance) recording and methods for resolving the issue: Calibration is…

The Nerve Chamber can be connected to biopotential amplifiers and/or a stimulator. Biopotential amplifiers (MCE100C, ERS100C, or EMG100C) connect via three JUMP100 connectors and three CBL200 adapter cables or, for…

We do not recommend using the pulse transducer on the same hand as the NIBP100A transducer if you are performing pulse transit time measurements. The NIBP100A will have some influence…

Sensor Height NIBP100A blood pressure measurements will differ depending on whether the sensor is placed lower or higher than the subject’s heart (sensor height relative to the subject’s heart). This…

The NIBP100A has a data output mode that outputs the blood pressure reading to AcqKnowledge only at the actual time of a successful reading. This results in a data record that contains…

Connect the NIBP100C analog output cable to the TCI105 and the DA100C amplifier. Set the DA100C amplifier to DC with a gain of 1000. In the AcqKnowledge Setup channels scaling…

There are several possible reasons for this. The most common is that the cursor has been positioned after the last cycle in the graph window. “Find All Cycles” does not…

Do not place the ground too close to the recording electrodes. If possible, place the ground equidistant from the recording electrodes (the equipment is quite robust in this regard, but the closer…

Any signal recorded from a BIOPAC amplifier can be output through the stimulator. The stimulator Source switch must be set to CH16 (mislabeled “CH 15”) and the amplifier must be set…

AcqKnowledge offers two methods for computing phasic skin conductance from tonic. Both methods are designed to isolate relatively quick changes in the signal. In one method, the raw skin conductance data are…