Any serious EEG system needs the ability to send accurate and precise time markers for triggers and events. Although wireless systems enable mobility, accurate timing is difficult due to the inherent latency and jitter in wireless communications. The Cognionics triggering system is a custom developed protocol to accurately broadcast time markers with millisecond precision. Because the timing accuracy is guaranteed in hardware, there is no need for software or algorithmic timing compensation making experiments simple and reliable, just like a traditional wireline setup.
The trigger box accepts the same inputs as a wired EEG system: an 8-bit TTL interface via DB-25, a RS232 serial via DB-9 and a USB virtual serial port making it compatible with virtually all popular triggering and stimulus presentation packages. Incoming markers are broadcast wirelessly to the mobile EEG electronics and integrated within the EEG data stream. Most users will require minimal, if any, modifications to an existing experimental paradigm to use the system.
The trigger box works with all of Cognionics EEG data acquisition systems which have the necessary receiver built in. Because the triggers are broadcast wirelessly, it is possible to send timing information to a virtually unlimited number of receiving systems in rage. This enables new experiments that are currently difficult or impossible, including multi-subject group research.
ERP recordings from an ambulatory subject using Cognionics' Wireless Triggering System
We're also happy to build customized wireless triggering systems if your experiment requires sources that require something besides the DB-25 and DB-9 connectors.
|Inputs||TTL, RS232 and USB|
|TTL Connector||DB-25 parallel|
|RS232 Connector||DB-9 serial|
|USB Connector||mini-B, virtual serial port interface (FTDI)|
|Timing Latency and Jitter||Less than 1 ms|
|Wireless Protocol||Proprietary 2.4 GHz|
|Range||10 meter typical|
|Power||via USB port|
|Dimensions||3.6" x 2.1" x 0.7"|