Absence of face-specific cortical activity in the complete absence of awareness: converging evidence from functional magnetic resonance imaging and event-related …

V Rodríguez, R Thompson, M Stokes, M Brett… - Journal of cognitive …, 2012 - direct.mit.edu
Journal of cognitive neuroscience, 2012direct.mit.edu
In this study, we explored the neural correlates of perceptual awareness during a masked
face detection task. To assess awareness more precisely than in previous studies,
participants employed a 4-point scale to rate subjective visibility. An event-related fMRI and
a high-density ERP study were carried out. Imaging data showed that conscious face
detection was linked to activation of fusiform and occipital face areas. Frontal and parietal
regions, including the pre-SMA, inferior frontal sulcus, anterior insula/frontal operculum, and …
Abstract
In this study, we explored the neural correlates of perceptual awareness during a masked face detection task. To assess awareness more precisely than in previous studies, participants employed a 4-point scale to rate subjective visibility. An event-related fMRI and a high-density ERP study were carried out. Imaging data showed that conscious face detection was linked to activation of fusiform and occipital face areas. Frontal and parietal regions, including the pre-SMA, inferior frontal sulcus, anterior insula/frontal operculum, and intraparietal sulcus, also responded strongly when faces were consciously perceived. In contrast, no brain area showed face-selective activity when participants reported no impression of a face. ERP results showed that conscious face detection was associated with enhanced N170 and also with the presence of a second negativity around 300 msec and a slow positivity around 415 msec. Again, face-related activity was absent when faces were not consciously perceived. We suggest that, under conditions of backward masking, ventral stream and fronto-parietal regions show similar, strong links of face-related activity to conscious perception and stress the importance of a detailed assessment of awareness to examine activity related to unseen stimulus events.
MIT Press
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