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Unconscious response priming by shape depends on geniculostriate visual projection
Univ Turku, Ctr Cognit Neurosci, Turku, Finland / Univ Turku, Dept Psychol, Turku, Finland .
Aalto Univ, Sch Sci, Brain Res Unit, Low Temp Lab, Helsinki, Finland / Aalto Univ, Sch Sci, Adv Magnet Imaging Ctr, Helsinki, Finland .
University of Skövde, School of Humanities and Informatics.ORCID iD: 0000-0002-2771-1588
Univ Turku, Ctr Cognit Neurosci, Turku, Finland / Univ Turku, Dept Psychol, Turku, Finland .
2012 (English)In: European Journal of Neuroscience, ISSN 0953-816X, E-ISSN 1460-9568, Vol. 35, no 4, 623-633 p.Article in journal (Refereed) Published
Abstract [en]

It has been suggested that unconscious visual processing of some stimulus features might occur without the contribution of early visual cortex (V1/V2). In the present study, the causal role of V1/V2 in unconscious processing of simple shapes in intact human brain was studied by applying transcranial magnetic stimulation (TMS) on early visual cortex or lateral occipital cortex (LO) while observers performed a metacontrast-masked response priming task with arrow figures as visual stimuli. Magnetic stimulation of V1/V2 impaired masked priming 3090 ms after the onset of the prime. Stimulation of LO reduced the magnitude of masked priming at 90120 ms, but this effect occurred only in the early parts of the priming experiment. A control task measuring the visibility of masked primes indicated that the orientation of masked primes could not be consciously discriminated and that TMS did not influence the conscious visibility of the primes indirectly by reducing the effectiveness of the mask in the critical time windows. We conclude that feedforward sweep of processing from V1/V2 (3090 ms) to LO (90 ms and above) is necessary for unconscious priming of shape, whereas conscious perception requires also the contribution of recurrent (feedback) processing.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2012. Vol. 35, no 4, 623-633 p.
Keyword [en]
consciousness, human brain, perception, primary visual cortex, transcranial magnetic stimulation
National Category
Natural Sciences
Research subject
Natural sciences
Identifiers
URN: urn:nbn:se:his:diva-5669DOI: 10.1111/j.1460-9568.2011.07973.xISI: 000300499300012PubMedID: 22304409Scopus ID: 2-s2.0-84857039205OAI: oai:DiVA.org:his-5669DiVA: diva2:513355
Available from: 2012-04-02 Created: 2012-04-02 Last updated: 2016-04-28Bibliographically approved

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CiteExportLink to record
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