Poster B66, Sunday, March 25, 8:00-10:00 am, Exhibit Hall C
What happens in the human brain when explicit warnings reduce false memories?
Sara Cadavid1, M. Soledad Beato2, Mar Suarez2; 1Universidad del Rosario, Colombia, 2Universidad de Salamanca, Spain
We analyzed the effects of warnings on false recognition (FR) employing Deese/Roediger-McDermott paradigm. In this paradigm, words associated to a non-presented critical lure are studied and, subsequently, critical lures are often falsely remembered/recognized. We collected behavioral data, and, furthermore, we used event-related potentials (ERPs) to understand what happens in the human brain when this memory task is performed with warnings. ERPs were obtained to study frontal FN400 (300-500 ms), left-parietal (500-800 ms), and late right-frontal (1000-1500 ms) old/new effects (associated with familiarity, recollection, and monitoring processes, respectively). First, at the behavioral level, although it was not possible to eliminate FR in Warning condition, as expected, FR was higher in the No-Warning condition. Second, the ERP results regarding the FN400 old/new effect showed similar patterns for true recognition and FR. Therefore, true recognition and FR seemed to share common underlying familiarity-based processes. Differences between Warning and No-Warning conditions were only observed on true recognition patterns, and only in this particular epoch: Warning-condition participants presented a more pronounced familiarity-related effect. This outcome suggests that warnings actually led to strategic encoding. ERP similarities between true recognition and FR disappeared when recollection processes were examined, because only true recognition presented a left-parietal old/new effect. Later, with the onset of monitoring processes, true recognition and FR waveforms presented, again, clearly similar patterns, showing both a late right-frontal old/new effect associated with post-retrieval monitoring processes. Together, findings suggest that, even when participants are provided with warning instructions, true recognition and FR share some common underlying processes.
Topic Area: LONG-TERM MEMORY: Episodic