Temporal dynamics of face inversion at encoding and retrieval

Objective: The aim of this study was to characterize the temporal dynamics of face encoding and recognition as a function of inversion. Methods: Event-related potentials (ERPs) were recorded while participants performed a recognition task in which orientation was manipulated both at study and retrieval. This procedure was used to compare the effects of same and different orientation at encoding and retrieval on early and later recognition-related components. Results: Changes in orientation from encoding to retrieval led to worse recognition performance, as compared to unchanged face orientations. Changes in face orientation were also associated with longer N170 latencies at retrieval. Later memory related ERP components (>300 ms) were affected by inversion and changes in orientation in a graded manner: upright faces encoded upright yielded the largest old-new effects, followed by inverted faces encoded inverted and finally by faces that differed in orientation from encoding to retrieval. Conclusions: These results suggest that the disruption of configural information caused by inversion has different effects on memory depending on whether the face is presented at retrieval with the same orientation as at encoding. Significance: These findings show a dynamic interplay between perception and memory in which face orientation interacts with structural encoding and memory. (C) 2010 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.