This specific component emerges consistently approximately 300 to 500 milliseconds after the onset of a meaningful stimulus, such as a word or image, making the 400-millisecond mark its canonical peak. The N400 is not an instantaneous event; it follows a carefully orchestrated sequence beginning with sensory encoding around 100-200 ms, leading to the core semantic integration window.
How Long Is N400 Process Timeline: Stages and Duration
Early perceptual analysis occurs within the first 200 milliseconds. Semantic activation and context building begin around 300 ms.
Consequently, the duration is not a fixed number but a flexible window that reveals the complexity of the cognitive operation being studied. Resolution and post-lexical integration extend beyond 500 ms.
How Long Is N400 Process Timeline: From Peak to Resolution
The Cascade of Cognitive Processing The question of duration is intertwined with the stages of cognition it indexes. The peak of the N400 waveform typically occurs at 400 ms.
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