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Abstract:
This study addressed the question of whether pictures and the
words that name them access a common conceptual representation.
Reaction times and ERP were recorded during a lexical and object
decision tasks. With the purpose to eliminate subject's strategies
associated to the lexical and object decisions, mediated pairs were
used. Mediated pairs are the indirect association between two words
or objects through a third (e.g. summer and snow are mediated
related through winter). The processing of words and the processing
of pictures was compared. The results showed that the lexical and
object decision tasks produce approximately similar amplitude
changes of N400, however, there were longer latencies of N400 to
pictures than to words. Source localization analysis using LORETA
method, showed different activation sites for each type of
stimulus. Overall, the results suggest that the major component in
a lexical and object decision is a form specific memory
representation of the word or visual object. This project was
partially supported by Grant IN214295 from DGAPA and Grant 1028P-H
from CONACyT.
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