2015
DOI: 10.1016/j.concog.2015.03.006
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Ignition’s glow: Ultra-fast spread of global cortical activity accompanying local “ignitions” in visual cortex during conscious visual perception

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Cited by 56 publications
(61 citation statements)
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“…Following standard preprocessing and HFB computation, we tested the onset response (50–350 ms, uncontaminated by either gaps or blinks) to each electrode optimal object stimuli, compared with the inter-block gray blank baseline periods (Figure 2). In agreement with previous reports (Noy et al, 2015a), responsivity of a considerable effect size was found almost entirely within the anatomically defined visual cortex, showing only minimal responses in more anterior cortical regions.
10.7554/eLife.17243.006Figure 2.High-frequency broadband (HFB, 70–150 Hz) visual responses to object images.HFB responses from all participants, sampled from 50 to 350 ms following the transition from one object image to another, compared with the HFB activity sampled during inter-block blanks are presented. Each circle marks the location of one electrode on a common cortical template.
…”
Section: Resultssupporting
confidence: 94%
“…Following standard preprocessing and HFB computation, we tested the onset response (50–350 ms, uncontaminated by either gaps or blinks) to each electrode optimal object stimuli, compared with the inter-block gray blank baseline periods (Figure 2). In agreement with previous reports (Noy et al, 2015a), responsivity of a considerable effect size was found almost entirely within the anatomically defined visual cortex, showing only minimal responses in more anterior cortical regions.
10.7554/eLife.17243.006Figure 2.High-frequency broadband (HFB, 70–150 Hz) visual responses to object images.HFB responses from all participants, sampled from 50 to 350 ms following the transition from one object image to another, compared with the HFB activity sampled during inter-block blanks are presented. Each circle marks the location of one electrode on a common cortical template.
…”
Section: Resultssupporting
confidence: 94%
“…Empirically, both local and global ignitions are revealed under various conditions (e.g., Dehaene and Changeux, 2005;Fisch et al, 2009;Noy et al, 2015). A plausible model for their generation is readily suggested by noting the dense lateral intra-and inter-areal connections that characterize cortical networks (e.g., Amir et al, 1993;Douglas and Martin, 1991; see review by Felleman and Van Essen, 1991).…”
Section: Mechanisms Underlying the Ignition Thresholdmentioning
confidence: 97%
“…Specifically, it has been previously proposed that, when ignition occurs in a network of cortical neurons, the corresponding content becomes subjectively available for conscious report. Alternative models emphasize a global neuronal workspace (GNW) that broadcasts a neural representation to many cortical sites (Dehaene and Changeux, 2011;Dehaene et al, 2003), or a more local framework where the subjective content depends mainly on ignition in content-selective representations (e.g., Noy et al, 2015). The neuronal ignition threshold would, therefore, be the physiological correlate of the threshold for content-specific perceptual awareness, as defined psychophysically.…”
Section: Consequences Of the Proposed Hypothesismentioning
confidence: 98%
“…If indeed, high neural activation in visual areas (which exceed an ignition threshold; e.g., Noy et al, ) is the most critical neural property that distinguishes conscious from unconscious perception, and if higher neural activation is a critical factor that enhances the precision of a neural representation, this provides further (neural) support for the empirical association between consciousness and precision.…”
Section: Tipping the Balance For Overflowmentioning
confidence: 98%