期刊
JOURNAL OF NEUROSCIENCE
卷 36, 期 18, 页码 5115-5127出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.4262-15.2016
关键词
continuous flash suppression; high-resolution fMRI; insula; interoception; visual awareness
资金
- Bertarelli Foundation
- Swiss National Science Foundation
- European Science Foundation
- National Center of Competence in Research, nCCR) SYNAPSY - The Synaptic Bases of Mental Diseases - Swiss National Science Foundation [51AU40_125759]
- Marie Sklodowska-Curie fellowship
- European Union Human Brain Project
The processing of interoceptive signals in the insular cortex is thought to underlie self-awareness. However, the influence of interoception on visual awareness and the role of the insular cortex in this process remain unclear. Here, we show in a series of experiments that the relative timing of visual stimuli with respect to the heartbeat modulates visual awareness. Weused two masking techniques and show that conscious access for visual stimuli synchronous to participants' heartbeat is suppressed compared with the same stimuli presented asynchronously to their heartbeat. Two independent brain imaging experiments using high-resolution fMRI revealed that the insular cortex was sensitive to both visible and invisible cardio-visual stimulation, showing reduced activation for visual stimuli presented synchronously to the heartbeat. Our results show that interoceptive insular processing affects visual awareness, demonstrating the role of the insula in integrating interoceptive and exteroceptive signals and in the processing of conscious signals beyond self-awareness.
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