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The investigation of the neural substrates of face perception constitutes an important area of study in both animal and cognitive neuroscience. Faces are used as stimuli in neurophysiological and neuroimaging studies for two primary reasons. First, from a practical standpoint, faces tend to evoke robust and strong responses relative to other objects, so that they are used in many studies that are not necessarily focused in the processing of faces per se, but their use may make the experiment more tractable. An example would be a study on the question of the fate in the visual system of information that is unattended by an observer: having the unattended stimuli be faces would allow experimenters to query known face-selective areas in the visual system for small ...

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