![]() Separate LSL connectors stream keyboard output and EEG data to the network. The computers are connected to a wired network via a switch.Each participant sits in front of a computer with a standard keyboard.There are four participants each having their EEG recorded with a LiveAmp. ![]() The possibilities with LSL are basically endless, but we want to give you some idea of how a hyperscanning setup with LSL might look like: Stay tuned for one of the upcoming issues of the hyperscanning series to read about how. Once the data is in this compatible format, it can be analyzed with the ease and convenience of BrainVision Analyzer 2. You can also look at MoBILAB which is a useful plugin for EEGLAB to load XDF files with multiple EEG streams and export the data to BrainVision Core Data format. Because the time stamps of all the recorded streams are synchronized and every sample or marker has a corresponding time stamp, you can analyze data with these respective tools. You can import the recorded XDF file with MATLAB via “load_xdf.m” or in Python using pyxdf with a function of the same name. Of course, you might have other streams in there, such as keyboard inputs or any other signals that may provide relevant information. This means you have at least one EEG stream for every participant and one stream including your LSL markers. The basic scheme can be seen in Figure 1.Įvery time you use LabRecorder, you end up with an XDF file that includes all the streams you selected before starting the recording. With our BrainVision LSL Viewer you can conveniently connect to the streams (make sure to have one instance per EEG stream) and monitor the signal quality online. This way, you can have both individual and global triggers/markers. However, it is still possible to send hardware triggers to the individual amplifiers, which will in turn be streamed together with the EEG. That said, it is good to run a few test recordings before beginning the actual experiment.Īs we are relying on LSL in this setup, you do not need any hardware for sending triggers as software markers can be streamed directly to the network. All these computers can be different computers, but this is not necessary. You will need computers running the LSL connectors, a recording computer with LabRecorder, and, if your experiment requires, a computer running an experiment control software to manage the paradigm and to send LSL markers for later analysis. When the streams are recorded in LabRecorder, all the selected streams are saved in one single XDF file and can later be synchronized based on these time stamps.įirst, make sure that all the involved computers are in the same local network. Each LSL EEG stream in the network comes with its own time stamps that are linked to each data point. Any EEG amplifier can be used if there is a corresponding LSL connector. Most importantly, the streams can originate from other EEG sources, which makes LSL a suitable tool for hyperscanning. Other streams can contain any type of signal, for example regular continuous signals or irregular signals without a stable sampling rate. ![]() Such EEG streams can be combined with other streams for online processing or for recording and synchronization. LSL is gaining more and more importance in the field of neuroscience because it enables you to easily stream EEG data to the network and connect to it with various clients. Part 3 introduces a more general approach, which is based on LabStreamingLayer (LSL). Rotation relativeRot = // Rotated 90 degrees on the x-axis compared to this primĭist = llGetSubString((string)MaxDist,0,(llSubStringIndex((string)MaxDist,".In the previous articles of our hyperscanning series, we outlined our gold standard recommendation for hyperscanning with BrainAmps, as well as showed you how to perform hyperscanning wirelessly with CGX Quick headsets and StimTrigger. Vector relativeVel = // Traveling in this prim's "forward" direction at 1m/s Vector relativePosOffset = // "Forward" and a little "above" this prim String object = "Rock" // Name of object in inventory Rez an object on touch, with relative position, rotation, and velocity all described in the rezzing prim's coordinate system. One last BIG question, i want to make my script, so, when it is touched (activated) It can NOT be activated again for a period of time.
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