Distinct top-down and bottom-up brain connectivity during visual perception and imagery
Publication year
2017Number of pages
9 p.
Source
Scientific Reports, 7, (2017), article 5677ISSN
Publication type
Article / Letter to editor

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Organization
SW OZ DCC AI
SW OZ DCC CO
Journal title
Scientific Reports
Volume
vol. 7
Languages used
English (eng)
Subject
Action, intention, and motor control; Cognitive artificial intelligence; DI-BCB_DCC_Theme 2: Perception, Action and Control; DI-BCB_DCC_Theme 4: Brain Networks and Neuronal CommunicationAbstract
Research suggests that perception and imagination engage neuronal representations in the same visual areas. However, the underlying mechanisms that differentiate sensory perception from imagination remain unclear. Here, we examine the directed coupling (effective connectivity) between fronto-parietal and visual areas during perception and imagery. We found an increase in bottom-up coupling during perception relative to baseline and an increase in top-down coupling during both perception and imagery, with a much stronger increase during imagery. Modulation of the coupling from frontal to early visual areas was common to both perception and imagery. Furthermore, we show that the experienced vividness during imagery was selectively associated with increases in top-down connectivity to early visual cortex. These results highlight the importance of top-down processing in internally as well as externally driven visual experience.
This item appears in the following Collection(s)
- Academic publications [204994]
- Electronic publications [103270]
- Faculty of Social Sciences [27347]
- Open Access publications [71799]
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