Abstract:
:An age-related "anterior shift" in the distribution of the P3b is often reported. Temporospatial principal component analysis (PCA) was used to investigate the basis of this observation. ERPs were measured in young and old adults during a visual oddball task. PCA revealed two spatially distinct factors in both age groups, identified as the posterior P3b and anterior P3a. Young subjects generated a smaller P3a than P3b, while old subjects generated a P3a that did not differ in amplitude from their P3b. Rather than having a more anteriorly distributed P3b, old subjects produced a large, temporally overlapping P3a. The pattern of the age-related "anterior shift" in the P3 was similar for target and standard stimuli. The increase in the P3a in elderly adults may not represent a failure to habituate the novelty response, but may reflect greater reliance on executive control operations (P3a) to carry out the categorization/updating process (P3b).
journal_name
Psychophysiologyjournal_title
Psychophysiologyauthors
Alperin BR,Mott KK,Rentz DM,Holcomb PJ,Daffner KRdoi
10.1111/psyp.12206subject
Has Abstractpub_date
2014-07-01 00:00:00pages
620-33issue
7eissn
0048-5772issn
1540-5958journal_volume
51pub_type
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