N400 congruency effects from emblematic gesture probes following sentence primes

Emblematic gesture pictures were presented to subjects as probes in relation to semantically congruent and incongruent sentences to investigate if there is a similar cognitive processing network for congruity as there is with words. Subjects had to perform a simple discrimination task while undergoing EEG recordings. The ERPs elicited by semantically incongruent gestures produced larger N400 and possibly N300 components. While the N400 is indicative of semantic processing showing that emblematic gestures are lexicalized, the N300 likely reflects the cognitive processing of picture stimuli.