We studied attentional modulation of cortical processing of faces and houses with functional MRI and magnetoencephalography (MEG). MEG detected an early, transient face-selective response. Directing attention to houses in ‘‘double-exposure’’ pictures of superimposed faces and houses strongly suppressed the charac- teristic, face-selective functional MRI response in the fusiform gyrus. By contrast, attention had no effect on the M170, the early, face-selective response detected with MEG. Late (>190 ms) cate- gory-related MEG responses elicited by faces and houses, however, were strongly modulated by attention. These results indicate that hemodynamic and electrophysiological measures of face-selective cortical processing complement each other. The hemodynamic signals reflect primarily late responses that can be modulated by feedback connections. By contrast, the early, face-specific M170 that was not modulated by attention likely reflects a rapid, feed- forward phase of face-selective processing.
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|Titolo:||Dissociation of face-selective cortical responses by attention|
|Autori:||M. L., Furey; T., Tanskanen; M. S., Beauchamp; S., Avikainen; K., Uutela; R., Hari; Haxby, James Van Loan|
|Titolo del periodico:||PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA|
|Anno di pubblicazione:||2006|
|Digital Object Identifier (DOI):||10.1073/pnas.0510124103|
|Appare nelle tipologie:||03.1 Articolo su rivista (Journal article)|