AI Article Synopsis
- This study builds on previous research about how the brain processes the meaning of words, focusing on a phenomenon called posterior semantic asymmetry (PSA) observed in event-related brain potentials (ERPs).
- The PSA occurs around 300 ms after a word is shown, with stronger brain activity noted during semantic tasks compared to non-semantic tasks, indicating more effort in activating word meanings.
- Additionally, the study found that this semantic processing was linked to verbal intelligence, highlighting its significance only for verbal stimuli, as no similar effect was observed for images.
Article Abstract
This study replicates and extends the findings of Koppehele-Gossel, Schnuerch, and Gibbons (2016) of a posterior semantic asymmetry (PSA) in event-related brain potentials (ERPs), which closely tracks the time course and degree of semantic activation from single visual words. This negativity peaked 300 ms after word onset, was derived by subtracting right- from left-side activity, and was larger in a semantic task compared to two non-semantic control tasks. The validity of the PSA in reflecting the effort to activate word meaning was again attested by a negative correlation between the meaning-specific PSA increase and verbal intelligence, even after controlling for nonverbal intelligence. Extending prior work, current source density (CSD) transformation was used. CSD results were consistent with a left temporo-parietal cortical origin of the PSA. Moreover, no PSA was found for pictorial material, suggesting that the component reflects early semantic processing specific to verbal stimuli.
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| http://dx.doi.org/10.1016/j.bandc.2018.05.011 | DOI Listing |
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