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Spatiotemporal analysis of event‐related potentials to upright, inverted, and contrast‐reversed faces: Effects on encoding and recognition
Author(s) -
Itier Roxane J.,
Taylor Margot J.,
Lobaugh Nancy J.
Publication year - 2004
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.2004.00183.x
Subject(s) - psychology , contrast (vision) , event related potential , cognitive psychology , audiology , neuroscience , electroencephalography , artificial intelligence , computer science , medicine
In an n‐back face recognition task where subjects responded to repeated stimuli, ERPs were recorded to upright, inverted, and contrast‐reversed faces. The effects of inversion and contrast reversal on face encoding and recognition were investigated using the multivariate spatiotemporal partial least squares (PLS) analysis. The configural manipulations affected early processing (100–200 ms) at posterior sites: Inversion effects were parietal and lateral, whereas contrast‐reversal effects were more occipital and medial, suggesting different underlying generators. A later reactivation of face processing areas was unique to inverted faces, likely due to processing difficulties. PLS also indicated that the “old–new” repetition effect was maximal for upright faces and likely involved frontotemporal areas. Marked processing differences between inverted and contrast‐reversed faces were seen, but these effects were similar at encoding and recognition.