Dissociation of face-selective cortical responses by attention
| Autor: | K. Uutela, Michael S. Beauchamp, James V. Haxby, Sari Avikainen, Maura L. Furey, Topi Tanskanen, Riitta Hari |
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| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Male
Dissociation (neuropsychology) Visual perception Time Factors Electroencephalography Brain mapping Temporal lobe Electromagnetic Fields medicine Humans Attention Brain Mapping Multidisciplinary Fusiform gyrus medicine.diagnostic_test Magnetoencephalography Biological Sciences Magnetic Resonance Imaging Temporal Lobe Facial Expression Electrophysiology Pattern Recognition Visual Data Interpretation Statistical Face Visual Perception Evoked Potentials Visual Female Psychology Neuroscience Photic Stimulation |
| Popis: | 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 characteristic, 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) category-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. |
| Databáze: | OpenAIRE |
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