Malach R, 2007, "Critical elements in human object perception" Perception 36 ECVP Abstract Supplement
Critical elements in human object perception
What are the critical neuronal activity patterns needed for eliciting an object percept? This deceptively simple question is actually extremely difficult to decipher. Here I address this question using fMRI data obtained from healthy subjects and electrical recordings in clinical patients. I focus on two spatio-temporal dimensions of neuronal activity in high-order ventral stream visual areas of the human cortex. At the temporal dimension, I show results from backward-masking experiments in which object images were presented briefly, followed by a disruptive visual stimulus. Results from such experiments reveal that a minimal ignition time leads to a unique profile of electrical activity as well as fMRI activation, and both are tightly linked to the emergence of an object percept. At the spatial dimension, I describe recent results indicating an antagonistic relationship between activity in human sensory areas and an intrinsic self-related cortical network. The relevance of these findings to neuronal models of human object perception is discussed.
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