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Similar frontal and distinct posterior cortical regions mediate visual and auditory perceptual awareness
Umeå universitet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper, Radiofysik. Umeå universitet, Medicinska fakulteten, Umeå centrum för funktionell hjärnavbildning (UFBI).
Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper, Diagnostisk radiologi. Umeå universitet, Medicinska fakulteten, Umeå centrum för funktionell hjärnavbildning (UFBI).
Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper, Diagnostisk radiologi. Umeå universitet, Medicinska fakulteten, Umeå centrum för funktionell hjärnavbildning (UFBI).
2007 (engelsk)Inngår i: Cerebral Cortex, ISSN 1047-3211, E-ISSN 1460-2199, Vol. 17, nr 4, s. 760-765Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Activity in ventral visual cortex is a consistent neural correlate of visual consciousness. However, activity in this area seems insufficient to produce awareness without additional involvement of frontoparietal regions. To test the generality of the frontoparietal response, neural correlates of auditory awareness were investigated in a paradigm that previously has revealed frontoparietal activity during conscious visual perception. A within-experiment comparison showed that frontal regions were related to both visual and auditory awareness, whereas parietal activity was correlated with visual awareness and superior temporal activity with auditory awareness. These results indicate that frontal regions interact with specific posterior regions to produce awareness in different sensory modalities.

sted, utgiver, år, opplag, sider
2007. Vol. 17, nr 4, s. 760-765
Emneord [en]
auditory awareness, fMRI, parietal cortex, prefrontal cortex, visual awareness
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-2762DOI: 10.1093/cercor/bhk029OAI: oai:DiVA.org:umu-2762DiVA, id: diva2:141026
Tilgjengelig fra: 2007-11-13 Laget: 2007-11-13 Sist oppdatert: 2018-06-09bibliografisk kontrollert
Inngår i avhandling
1. The conscious brain: Empirical investigations of the neural correlates of perceptual awareness
Åpne denne publikasjonen i ny fane eller vindu >>The conscious brain: Empirical investigations of the neural correlates of perceptual awareness
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Although consciousness has been studied since ancient time, how the brain implements consciousness is still considered a great mystery by most. This thesis investigates the neural correlates of consciousness by measuring brain activity with functional magnetic resonance imaging (fMRI) while specific contents of consciousness are defined and maintained in various experimental settings. Study 1 showed that the brain works differently when creating a new conscious percept compared to when maintaining the same percept over time. Specifically, sensory and fronto-parietal regions were activated for both conditions but with different activation patterns within these regions. This distinction between creating and maintaining a conscious percept was further supported by Study 2, which in addition showed that there are both differences and similarities in how the brain works when defining a visual compared to an auditory percept. In particular, frontal cortex was commonly activated while posterior cortical activity was modality specific. Study 3 showed that task difficulty influenced the degree of frontal and parietal cortex involvement, such that fronto-parietal activity decreased as a function of ease of identification. This is interpreted as evidence of the non-necessity of these regions for conscious perception in situations where the stimuli are distinct and apparent. Based on these results a model is proposed where sensory regions interact with controlling regions to enable conscious perception. The amount and type of required interaction depend on stimuli and task characteristics, to the extent that higher-order cortical involvement may not be required at all for easily recognizable stimuli.

sted, utgiver, år, opplag, sider
Umeå: Psykologi, 2007. s. 68
Serie
Umeå studies in cognitive science, ISSN 1654-2568 ; 4
Emneord
consciousness, visual perception, object identification, functional neuroimaging, top-down processing, prefrontal cortex, auditory perception
HSV kategori
Identifikatorer
urn:nbn:se:umu:diva-1430 (URN)978-91-7264-457-1 (ISBN)
Disputas
2007-12-07, MA 121, MIT-huset, Umeå Universitet, Umeå, 10:15
Opponent
Veileder
Tilgjengelig fra: 2007-11-13 Laget: 2007-11-13 Sist oppdatert: 2018-01-13bibliografisk kontrollert

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