Neural "Ignition": Enhanced Activation Linked to Perceptual Awareness in Human Ventral Stream Visual Cortex

Lior Fisch, Eran Privman, Michal Ramot, Michal Harel, Yuval Nir, Svetlana Kipervasser, Fani Andelman, Miri Y. Neufeld, Uri Kramer, Itzhak Fried, Rafael Malach*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Human recognition performance is characterized by abrupt changes in perceptual states. Understanding the neuronal dynamics underlying such transitions could provide important insights into mechanisms of recognition and perceptual awareness. Here we examined patients monitored for clinical purposes with multiple subdural electrodes. The patients participated in a backward masking experiment in which pictures of various object categories were presented briefly followed by a mask. We recorded ECoG from 445 electrodes placed in 11 patients. We found a striking increase in gamma power (30-70 Hz) and evoked responses specifically associated with successful recognition. The enhanced activation occurred 150-200 ms after stimulus onset and consistently outlasted the stimulus presentation. We propose that the gamma and evoked potential activations reflect a rapid increase in recurrent neuronal activity that plays a critical role in the emergence of a recognizable visual percept in conscious awareness.

Original languageEnglish
Pages (from-to)562-574
Number of pages13
Issue number4
StatePublished - 25 Nov 2009


FundersFunder number
National Institute of Neurological Disorders and StrokeR01NS033221
Israel Science Foundation160/07


    • sysneuro


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