A combination of thematic and similarity-based semantic processes confers resistance to deficit following left hemisphere stroke.

Frontiers in Human Neuroscience
Solène KalénineLaurel J Buxbaum

Abstract

Semantic knowledge may be organized in terms of similarity relations based on shared features and/or complementary relations based on co-occurrence in events. Thus, relationships between manipulable objects such as tools may be defined by their functional properties (what the objects are used for) or thematic properties (e.g., what the objects are used with or on). A recent study from our laboratory used eye-tracking to examine incidental activation of semantic relations in a word-picture matching task and found relatively early activation of thematic relations (e.g., broom-dustpan), later activation of general functional relations (e.g., broom-sponge), and an intermediate pattern for specific functional relations (e.g., broom-vacuum cleaner). Combined with other recent studies, these results suggest that there are distinct semantic systems for thematic and similarity-based knowledge and that the "specific function" condition drew on both systems. This predicts that left hemisphere stroke that damages either system (but not both) may spare specific function processing. The present experiment tested these hypotheses using the same experimental paradigm with participants with left hemisphere lesions (N = 17). The results revealed...Continue Reading

Citations

Jun 10, 2014·Psychophysiology·Stefanie E KuchinskyMark A Eckert
Jul 9, 2016·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Solène Kalénine, Laurel J Buxbaum
Oct 30, 2015·Behavior Research Methods·Olessia Jouravlev, Ken McRae
Nov 29, 2017·Frontiers in Human Neuroscience·Ikram MethqalYves Joanette
Jul 16, 2019·Journal of Clinical and Experimental Neuropsychology·Catherine MerckSolène Kalénine

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