Online Event Triggering

Threshold-based criteria respond when an incoming signal reaches a predefined level, whereas pattern-based criteria identify a specified configuration in the data. This distinction lets researchers match event detection to the structure of the signal being monitored. Choosing an appropriate criterion determines which neural, physiological, behavioral, or stimulus-related events initiate the experimental response.

Temporal alignment links an observed event to the experimental action that follows it, such as stimulation, recording, imaging, or a behavioral task. Because the response begins during data acquisition rather than after offline analysis, researchers can examine neural dynamics and sensorimotor interactions with closer correspondence between the detected event and the resulting experimental condition.

The triggering system can evaluate continuously acquired neural, physiological, behavioral, or stimulus signals. This broad input range allows the event criterion to be matched to the experiment's central measurement or task state. The selected signal and its threshold or pattern determine what condition the system treats as meaningful enough to initiate an immediate response.

A typical workflow acquires data continuously, evaluates the incoming signal against predefined threshold or pattern criteria, and sends a trigger when the specified condition occurs. The trigger then initiates the planned experimental response, which may involve stimulation, recording, imaging, or a behavioral task. This sequence supports time-sensitive experiments without waiting for offline analysis.

In a closed-loop design, ongoing measurements influence what the experiment does next. Online Event Triggering supplies the link between the detected neural, physiological, behavioral, or stimulus event and the corresponding experimental action. This arrangement enables stimulation, imaging, recording, or task events to be synchronized with current activity, supporting investigations of adaptive brain responses.

Researchers would use this approach when an experimental response must follow a detected event during the ongoing acquisition period. It is especially relevant to studies of neural dynamics, sensorimotor interactions, and adaptive brain responses, where delayed action could weaken temporal correspondence. Immediate triggering reduces dependence on post hoc analysis for coordinating time-sensitive experimental events.