AI Article Synopsis
- One theory of visual awareness suggests that brain activity linked to awareness happens in two phases: around 200 ms for visual stimuli and around 300 ms for further processing.
- Research recorded brain activity while subjects listened to tones at their personal awareness threshold.
- The study found similar patterns in auditory awareness as in visual awareness, confirming early and late brain responses that indicate awareness of sounds.
Article Abstract
One theory of visual awareness proposes that electrophysiological activity related to awareness occurs in primary visual areas approximately 200 ms after stimulus onset (visual awareness negativity: VAN) and in fronto-parietal areas about 300 ms after stimulus onset (late positivity: LP). Although similar processes might be involved in auditory awareness, only sparse evidence exists for this idea. In the present study, we recorded electrophysiological activity while subjects listened to tones that were presented at their own awareness threshold. The difference in electrophysiological activity elicited by tones that subjects reported being aware of versus unaware of showed an early negativity about 200 ms and a late positivity about 300 ms after stimulus onset. These results closely match those found in vision and provide convincing evidence for an early negativity (auditory awareness negativity: AAN), as well as an LP. These findings suggest that theories of visual awareness are also applicable to auditory awareness.
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| http://dx.doi.org/10.1016/j.concog.2019.03.008 | DOI Listing |
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