ASSOCIATIVE ERP EFFECTS WITH MEMORIES OF ARTIFICIAL FACES

A previous study Valdes-Sosa and Bobes, 1990) described a negative ERP component evoked by mis-matches in a face-feature matching task, usin g photographs of real faces. This component could be N400 (or an analo gue), elicited by associative priming within a non-linguistic domain: that of face structure. To confirm this it is necessary to demonstrate that semantic/linguistic recoding was not a necessary condition in tr iggering the negativity. This means falsifying what we call the 'primi ng by proxy' hypothesis, and locating the triggering mis-match within face structure. In this paper subjects studied artificial schematic fa ces over several sessions, and 1 week later were presented with a face -feature matching task with simultaneous ERP recording. Since no seman tic information or verbal labels were available, eliciting a mis-match negativity with these faces contradicts the 'priming by proxy' hypoth esis. In a first experiment, in which the subjects learning was contro lled through a face familiarity decision task, no significant mis-matc h negativity was found. However, in a second experiment in which learn ing was controlled through a forced-choice face-feature match, a signi ficant mis-match negativity was found in the subsequent recording sess ion. This result supports the idea that a component similar to N400 ca n be elicited by an associative mis-match restricted to the face-struc tural domain.