The prefrontal cortex's role in consciousness is contested: frontal theories claim it is necessary, while sensory theories argue consciousness arises from the posterior cortex alone, with prefrontal activity only reflecting reporting. Re-analyzing EEG data from 30 participants in a no-report inattentional blindness paradigm, source reconstruction and dynamic causal modeling estimated effective connectivity between prefrontal and posterior regions. A hypothesis-driven analysis found that both theories could explain the data, with a slight preference for frontal theories: a model disabling backward connections within the posterior cortex explained awareness better (53%) than one without backward connections from prefrontal to sensory regions. The findings suggest a subtle but crucial frontal contribution and call for revising current theories.
Top-down attention affects not just whether we see something, but how we see it—the quality of conscious experience, or qualia. Using a dual-task paradigm, participants rated similarity of stimulus pairs in the periphery for rotated letters, bisected disks, and greyscale faces. Similarity ratings served as a proxy for qualia structures, analyzed with dimension reduction and optimal transport alignment. Attention withdrawal collapsed qualia structures for letters and disks, but alignment accuracy remained high for face qualia structures under both full and poor attention. This relational judgment approach extends previous binary categorization methods and offers a novel way to study qualia structures.