Full Wireless Triggering System

 

Full Trigger

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. This lack of accuracy is present in all wireless EEG solutions. The Cognionics triggering system is a custom developed protocol to accurately broadcast time markers with millisecond precision, resolving the issues of latency and jitter. 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 wired 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.

 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.

 

Specifications

Model   USB Trigger   Full Trigger
Inputs        USB   TTL, RS232 and USB
TTL Connector    None   DB-25 parallel
RS232 Connector    None   DB-9 serial
USB Connector    USB-A, virtual serial port interface (FTDI)   mini-B, virtual serial port interface (FTDI)
Timing Latency and Jitter    Less than 6ms   Less than 2 ms
Wireless Protocol    Proprietary 2.4Ghz   Proprietary 2.4 GHz
Range    10 meter typical   10 meter typical
Power    Via USB Port   Via USB port
Dimensions    2.5" x 1" x .4"   3.6" x 2.1" x 0.7"

Diagrams

 Full Trigger

ERP recordings from an ambulatory subject using Cognionics' Wireless Triggering System

 

Datasheet

Download product data sheet

 

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