Zusammenfassung
Looking at ambiguous figures results in rivalry with spontaneous alternation
between two percepts. Using event-related functional magnetic resonance
imaging, we localized transient human brain activity changes during
perceptual reversals. Activation occurred in ventral occipital and
intraparietal higher-order visual areas, deactivation in primary
visual cortex and the pulvinar. Thus, without any physical stimulus
changes, salient perceptual flips briefly engage widely separated
specialized cortical areas, but are also associated with intermittent
activity breakdown in structures putatively maintaining perceptual
stability. Together, the dynamics of integrative perceptual experience
are reflected in rapid spatially differentiated activity modulation
within a cooperative set of neural structures.
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