Accessing ActiveTwo skin-conductance/GSR signals through the C++ SDK

As you will see in these posts at the Biosemi forum: https://www.biosemi.nl/forum/viewtopic.php?f=7&t=808&p=2450  www.biosemi.nl/forum/viewtopic.php?f=7&t=607 GSR data undergoes additional processing within ActiveView before storage in the BDF file. GSR signals are normally processed within ActiView to derive a meaningful signal from the original excitation / oscillator signal. Note: this discussion assumes your GSR unit is of the…

Read More

Can I record high-density sEMG with the ActiveTwo system?

High density surface EMG as described in the recent publications on the Biosemi site is possible with the addition of the sEMG accessories. The original model of the high density sEMG probe was made for ActiveOne, so the connector differed. The current version separates the electrode grid from the preamp as in: reusable grid sEMG preamplifier…

Read More

Can I install ActiView on a Windows 10 computer?

You CAN install current versions of ActiView on Windows 10. But, before you do so, if the system was orignally delivered before January of 2017 you should update the firmware on the optical receiver / USB interface so that you do not have to go through the very long and arduous process of installing an…

Read More

Where can I find the coordinates of the 128 channel caps based on the 5% system defined by Oostenveld and Praamstra?

The positions in these caps come from the Oostenveld and Praamstra 5% system.  See http://robertoostenveld.nl/electrode/ for background and for links to electrode coordinates in a variety of formats. Depending on what software you are using for analysis, we might be able to provide another file format. The Biosemi channel assignments (relating electrode labels to electrode sites in…

Read More

What are the computer requirements for ActiveTwo?

ActiveTwo is provided with drivers and host data acquisition software for Windows and Mac computers, and drivers also exist for Linux. Note that certain applications, such as event-related potentials, often require a separate computer to run experimental control / stimulus delivery software. In brief, the computer requirements for the ActiView data acquisition software are: Operating…

Read More

How do I perform the one-bucket test to identify faulty electrodes? Or, why does the blue CM in Range flicker and the signals pulsate once every half second?

The blue CM in Range light reflects two things: 1) whether the CMS and DRL electrodes are adequately connected to the participant’s body, and 2) whether all of the other active electrodes, cables and connectors are intact.  If any of these are NOT true, then the blue CM in Range light will flicker and the…

Read More

Is every TMS system EEG compatible?

Maybe.  There is no way the EEG system can harm the TMS system, but there are some TMS systems that are essentially useless with some EEG systems.  You need a a suitable combination of features in each to be successful at all in using TMS with EEG. Desirable attributes: Coils designed specifically for use with…

Read More

Is every EEG system TMS compatible?

No.  There are a few special attributes that are required and others that are desirable. Required attributes: Inputs should be protected so that they are not damaged by the TMS pulse Frequency response on all channels should be from DC on the low end, since AC coupled inputs will “ring” when presented with a large…

Read More

Can I ship multiple work orders in one box?

If you have more than one item to be repaired, we will normally issue a separate work order number for each item.  In that case, it is not necessary to ship the items to us separately.  They can be packed together, assuming you pack carefully and include the documentation we request when we send you…

Read More

What are the terms of the warranty on your products?

Warranty Hardware All of our hardware products are delivered with at least a one-year warranty.  This warranty covers materials and manufacturing defects.  If you find that a product is not functioning as it should, please contact us immediately.  We will work with the manufacturer to resolve the problem for you. There are a few exceptions…

Read More

What is a Service Level Agreement (SLA)?

We know that nothing makes a laboratory more productive than well-maintained equipment and a staff that is well-trained in its use.  Take advantage of our service options to safeguard the investment you have made in our products. Support above-and-beyond warranty related issues is offered in the form of Service Level Agreements.  If there are no…

Read More

How can I arrange for a repair?

Before you send anything to us for repair, please contact us so we can assess the situation and be sure that is the best course of action.   Once you have exhausted all available options, we may authorize you to return an item for repair.  At that point, see the steps below under “How to arrange for a…

Read More

Installation and training

When you purchase a new laboratory instrument, you want to get started using it and producing results as quickly as possible, and nothing helps you accomplish this goal faster than having a trained technician visit your lab to install the system and configure it optimally for your purposes. From our perspective, you will have the…

Read More

What sort of protocols are possible with the PowerMAG?

You may perform a wide variety of protocols using the PowerMAG system; ppTMS, rTMS, TBS, and even Quattro pulse. Please refer to the following chart to determine which platform is most appropriate for your research. Stimulators PowerMAG lab 30 PowerMAG lab 100 PowerMAG EEG 30 PowerMAG EEG 100 PowerMAG ppTMS PowerMAG QPS Characteristic Economic research…

Read More

What are the advantages/disadvantages of passively cooled coils?

The coils used with the PowerMAG system are in fact passively cooled, they utilize quality copper windings with excellent heat dispersion properties. The coils are then placed within a wax like medium that further enhances heat dissipation, as the coil heats up the internal medium changes to a liquid state effectively “absorbing” much of the…

Read More

How deep can you stimulate using the PowerMAG?

This really comes down to the properties of the coil utilized. The two main style of stim coils used within the TMS field are figure 8 and round, with figure 8 often being preferred for focal targeting. Typically with the figure 8 coil you would get greatest stimulation at a depth of roughly 2- 2.5cm,…

Read More

How are the audio cables routed into the MR scan room?

Shielded BNC cables are routed through a filter box/transformer. The supplied BNC connectors will need to be mounted within your penetration panel, this will require two 11mm holes for this purpose, the supplied RF filters will be connected on the MR side with 9 meters of cabling to connect to the headphones. Typically cables run…

Read More

What is the typical configuration for the MR Confon/BOLDfonic system?

The BOLDfonic system is comprised of the MR Confon main console, an operator microphone, a set of patient/participant insert earphones, control room monitoring speakers, along with all audio cables, connectors, and filters necessary for full installation — just supply the audio output from your PC or alternative source via a ⅛ in. audio cable or…

Read More

How do you view the monitor while in the scanner?

Traditionally the BOLDScreen is placed at the rear of the scanner at the end of the bore. The monitor can be viewed with an OEM “viewing mirror” that mounts to the headcoil, these are usually included from the manufacturer of the headcoil. Depending on the size of your scanner’s bore (e.g. 60, 70cm), you may…

Read More

Can my standard PC “drive” the BOLDScreen 32?

Most “standard” PC’s are adequately suited for driving the BOLDScreen 32 if they offer a dual-link DVI output. For laptops this can often be achieved by the use of a DisplayPort to Dual-Link DVI adapter. It is important to determine in advance whether your laptop offers a DisplayPort output for this purpose. If you are…

Read More

How long is the video cabling for the BOLDScreen 32?

The BOLDScreen 32 comes standard with 30 meters of fiber optic cabling (duplex LC/SC), other lengths are possible as this fiber optic cable is available online through various sources. Some choose to run this around the periphery of the scan room, while others prefer to run it through conduit or channeling in the ceiling and…

Read More

How close to the scanner can the BOLDScreen 32 be placed?

The CRS BOLDScreen units have been specifically designed to be directly placed at the rear of the bore of the scanner, without any distance constraints. The BOLDScreen 32 is compatible with scanners with a field strength up to 7T, while the BOLDScreen 23 and 24 are compatible with those up to 3T.

Read More

What comes standard with the BOLDScreen 32?

BOLDScreen 32 setup, this consist of: monitor, fiber optic cabling (30 meters), DVI/fiber optic converter, adjustable height aluminum tripod/stand, and power supply and MR friendly converter unit. Often users will opt to purchase a trolley for portability and versatility in setup.

Read More

What is the ideal interoptode spacing?

This is really dependent on the signal quality. Typically for normal cortical penetration you will want anywhere from 3cm up, the larger the distance the deeper the penetration however at the sake of a reduced signal-to-noise ratio. Typically for normal adults we employ a 3.5cm interoptode distance, for those with darker skin or dark/dense hair…

Read More

What are the advantages of LED over laser?

Lasers often require greater consideration in application. There are certainly constraints with regard to motility with a laser based setup that may not be of any concern with LED. Preparation times are often greater with laser than LED, as lasers are often added to a headcap one by one, whereas LED sources could sometimes be…

Read More

What are the advantages of laser over LED?

Lasers naturally provide a very focal output and are excellent with narrow band frequency emission, thus the ability to discretely “tune” the light output is perhaps of some value, as you might imagine when studying the dispersion of light. Additionally modulation of lasers can take place many times fast than that of LED, as there…

Read More

Is fNIRS comparable to fMRI?

fNIRS is of course a completely different modality than fMRI, however while the mechanics may differ there is overlap in the resulting measurements, ultimately cerebral blood flow and metabolic measurements may be obtained, and neuronal activation often assumed. fNIRS is specific to oxygenated and deoxygenated hemoglobin measurement and quantification due to light back reflection, while…

Read More

Is fNIRS safe?

Very good, and important, question. Clearly fNIRS is employing frequencies of light that are purposely used to traverse the skull without much restraint, and this is in fact introducing exogenous stimuli. Well don’t fret, the amount of signal power using fNIRS can be comparable to sunlight. Further, of recent, several studies suggest there are various…

Read More

What other things can I measure with my OxyMon?

Depending on your interest, quite a bit. We are able to “tune” the frequencies of the lasers to different wavelengths, thereby offering the possibility to measure things such as Cytohrome C Oxidase (COX), and Indocyanine Green (ICG) tracer. Just let us know if you have anything particular in mind!

Read More