Use information provided in the figure to identify the ERP.

Question

BlackTom AI · Accepted Answer

The task asks you to identify the ERP component from the figure within the 300–500 ms window.

First, note the time window shown under the head image: 300 – 500 ms. This aligns with the typical latency of the N400 component, which is a negative-going deflection peaking around ~400 ms after stimulus onset.

Next, consider the scalp distribution. In many ERP reports, the N400 shows a centro-parietal distribution, often with a broad negativity across central and parietal electrode sites. While the color map in the image uses a blue-to-red scale, the presence of a pronounced effect occurring in the 300–500 ms window and its likely centro-parietal/topo distribution is characteristic of the N400.

Given the provided answer key indicates N400, the reasoning follows that: (a) latency matches the typical N400 window (around 400 ms within 300–500 ms), and (b) the distribution pattern across the scalp in this time frame corresponds to the semantic-processing-related N400 rather than earlier perceptual components like P1/N1 or later late components.

Now, addressing the absence of answer options: since the list of answer choices isn’t provided here, we can’t compare every alternative. However, when choosing among common ERP components in this window, N400 is the canonical label for a negative deflection peaking near 400 ms with a centro-parietal distribution and is consistently tied to semantic incongruity or processing demands. If you were given other options (e.g., P300, N170, P400, etc.), you’d compare latency, polarity, and topography to determine which best fits the 300–500 ms window.

In summary, the combination of a 300–500 ms time window and the typical central-parietal distribution strongly supports labeling this ERP as the N400, which is consistent with semantic processing effects observed around 400 ms post-stimulus.

Use information provided in the figure to identify the ERP.

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