Trigger

Definition: A trigger is a timing marker of experimental events and is typically used to synchronize various signals in time. A trigger is represented by a certain value (e.g., numbers, letters), with different values indicating different events (e.g., start or end of a stimulus, trial, block, or condition).

Alternative definition:

Synonym: Stimulus marker, Event marker

References:

Related terms: Stimulus onset, Stimulus offset, Response onset, Block design, Event-related design, Lab Streaming Layer (LSL)