Poster C54, Sunday, March 25, 1:00-3:00 pm, Exhibit Hall C
The Effects of Age and Familial Sinistrality on Late Positive Components
Michelle Leckey1, Kara D. Federmeier1; 1University of Illinois at Urbana-Champaign
The P600 – a late, positive ERP component – has been linked to syntactic processing, as P600 effects have been seen in response to syntactic violations as well as during complex sentence processing. A P600 response has also been seen to violations of thematic constraint, when the more semantically related N400 component may have been expected. Given a number of similarities between the P600 and the more general P3b component, some have proposed that the P600 is a P3b, with differences in latency and amplitude reflecting the complexity of linguistic structure. Previous work has found that the P600, like the P3b, is response aligned, and is modulated by saliency, task relevance and subjective probability, all of which are known to modulate the P3b. Despite these similarities, no one has yet made direct comparisons between them when they are elicited within the same person using component-typical tasks. In the current study 48 young adults with differing familial sinistrality profiles and 24 older adults, were given three tasks, each of which is known to elicit one of the components of interest. These included a visual oddball (P3b), as well as morphosyntactic and thematic role violations (syntactic/semantic P600). Each of the tasks elicited the desired components, and analyses suggest similarities between the syntactic P600 and the P3b, providing further evidence that these components may be related. However there are differences between these components and the semantic P600, suggesting that the semantic and syntactic P600 may be reflecting different types of processing.
Topic Area: LANGUAGE: Syntax