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Early processing in primary visual cortex is necessary for conscious and unconscious vision while late processing is necessary only for conscious vision in neurologically healthy humans
Department of Psychology, University of Turku, Finland / Centre for Cognitive Neuroscience, University of Turku, Finland / Turku Brain and Mind Centre, University of Turku, Finland.
Department of Psychology, University of Turku, Finland / Centre for Cognitive Neuroscience, University of Turku, Finland / Turku Brain and Mind Centre, University of Turku, Finland.
University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Department of Psychology, University of Turku, Finland / Centre for Cognitive Neuroscience, University of Turku, Finland / Turku Brain and Mind Centre, University of Turku, Finland. (Kognitiv neurovetenskap och filosofi, Consciousness and Cognitive Neuroscience)ORCID iD: 0000-0002-2771-1588
Department of Psychology, University of Turku, Finland / Centre for Cognitive Neuroscience, University of Turku, Finland / Turku Brain and Mind Centre, University of Turku, Finland.
2017 (English)In: NeuroImage, ISSN 1053-8119, E-ISSN 1095-9572, Vol. 150, 230-238 p.Article in journal (Refereed) Published
Abstract [en]

The neural mechanisms underlying conscious and unconscious visual processes remain controversial. Blindsight patients may process visual stimuli unconsciously despite their VI lesion, promoting anatomical models, which suggest that pathways bypassing the VI support unconscious vision. On the other hand, physiological models argue that the major geniculostriate pathway via VI is involved in both unconscious and conscious vision, but in different time windows and in different types of neural activity. According to physiological models, feedforward activity via VI to higher areas mediates unconscious processes whereas feedback loops of recurrent activity from higher areas back to VI support conscious vision. With transcranial magnetic stimulation (TMS) it is possible to study the causal role of a brain region during specific time points in neurologically healthy participants. In the present study, we measured unconscious processing with redundant target effect, a phenomenon where participants respond faster to two stimuli than one even when one of the stimuli is not consciously perceived. We tested the physiological feedforward-feedback model of vision by suppressing conscious vision by interfering selectively either with early or later VI activity with TMS. Our results show that early VI activity (60 ms) is necessary for both unconscious and conscious vision. During later processing stages (90 ms), VI contributes selectively to conscious vision. These findings support the feedforward-feedback-model of consciousness.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 150, 230-238 p.
Keyword [en]
redundant target effect, TMS, V1, unconscious vision
National Category
Neurosciences Bioinformatics (Computational Biology) Neurology
Research subject
Consciousness and Cognitive Neuroscience
Identifiers
URN: urn:nbn:se:his:diva-13578DOI: 10.1016/j.neuroimage.2017.02.060ISI: 000399855800019PubMedID: 28254455Scopus ID: 2-s2.0-85013892326OAI: oai:DiVA.org:his-13578DiVA: diva2:1097964
Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-10-10Bibliographically approved

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