Why some faces won’t be remembered: brain potentials illuminate successful versus unsuccessful encoding for same-race and other-race faces
- Department of Psychology, Northwestern University, Evanston, IL, USA
Memory is often less accurate for faces from another racial group than for faces from one’s own racial group. The mechanisms underlying this phenomenon are a topic of active debate. Contemporary theories invoke factors such as inferior expertise with faces from other racial groups and an encoding emphasis on race-specifying information. We investigated neural mechanisms of this memory bias by recording event-related potentials while participants attempted to memorize same-race (SR) and other-race (OR) faces. Brain potentials at encoding were compared as a function of successful versus unsuccessful recognition on a subsequent-memory test. Late positive amplitudes predicted subsequent memory for SR faces and, to a lesser extent, for OR faces. By contrast, the amplitudes of earlier frontocentral N200 potentials and occipito-temporal P2 potentials were larger for later-remembered relative to later-forgotten OR faces. Furthermore, N200 and P2 amplitudes were larger for OR faces with features considered atypical of that race relative to faces that were race-stereotypical (according to a consensus from a large group of other participants). In keeping with previous reports, we infer that these earlier potentials index the processing of unique or individuating facial information, which is key to remembering a face. Individuation may tend to be uniformly high for SR faces but lower and less reliable for OR faces. Individuation may also be more readily applied for OR faces that appear less stereotypical. These electrophysiological measures thus provide novel evidence that poorer memory for OR faces stems from encoding that is inadequate because it fails to emphasize individuating information.
Keywords: facial memory, recognition, social categorization, expertise, EEG, ERPs, other-race effect
Citation: Lucas HD, Chiao JY and Paller KA (2011) Why some faces won’t be remembered: brain potentials illuminate successful versus unsuccessful encoding for same-race and other-race faces. Front. Hum. Neurosci. 5:20. doi: 10.3389/fnhum.2011.00020
Received: 17 November 2010;
Accepted: 16 February 2011;
Published online: 08 March 2011.
Copyright: © 2011 Lucas, Chiao and Paller. This is an open-access article subject to an exclusive license agreement between the authors and Frontiers Media SA, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited.
*Correspondence: Heather D. Lucas, Department of Psychology, Northwestern University, 2029 Sheridan Road, Evanston, IL 60201, USA. e-mail: firstname.lastname@example.org