Hemispheric decoupling of awareness-related activity in human auditory cortex under informational masking and divided attention
bioRxiv (Cold Spring Harbor Laboratory)(2023)
摘要
The conditions under which sensory stimuli require selective attention to reach awareness is a fundamental question of cognitive neuroscience. We examined this question in the context of audition utilizing M/EEG and a dual-task informational-masking paradigm. Listeners performed a demanding primary task in one ear – detecting isochronous target-tone streams embedded in random multi-tone backgrounds and counting within-stream deviants – and retrospectively reported their awareness of secondary, masker-embedded target streams in the other ear. Irrespective of attention or ear, left-AC activity strongly covaried with target-stream detection starting as early as 50 ms post-stimulus. In contrast, right-AC activity was unmodulated by detection until later, and then only weakly. Thus, under certain conditions, human ACs can functionally decouple, such that one – here, right – is automatic and stimulus-driven while the other – here, left – supports perceptual and/or task demands, including basic perceptual awareness of nonverbal sound sequences.
### Competing Interest Statement
The authors have declared no competing interest.
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