Resolution and post-lexical integration extend beyond 500 ms. 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.
Investigating N400 Process Length and ERP Latency Factors
The peak of the N400 waveform typically occurs at 400 ms. Variability in the Component While the classic timeline provides a reliable template, the exact duration of the N400 can shift based on experimental design.
Methodological Influences on Timing The duration recorded in an ERP waveform is heavily dependent on the type of manipulation employed. Stimulus Type Typical Peak Latency Duration of Effect Single Word ~400 ms 300-500 ms Sentence Final Word ~400-450 ms 400-600 ms Visual Object Mismatch ~400-500 ms 350-550 ms Clinical and Applied Perspectives.
Investigating N400 Process Length and ERP Latency Factors
Consequently, the duration is not a fixed number but a flexible window that reveals the complexity of the cognitive operation being studied. For instance, subtle semantic violations might produce a more protracted N400 lasting longer than 400 ms, whereas stark contradictions between a sentence and its final word generate a sharp, distinct peak.
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