Subjective artificiality directs visual processing during photo perception to ventral, subjective authenticity to dorsal streams M Behrens1, P Nicklas2, C Kell1 |
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1Brain Imaging Center, Department of Neurology, Johann Wolfgang Goethe University, Germany |
| A snapshot often captures a moment of real life in a naturalistic fashion, while many professional photographs create an artificial image that presents an arranged and modified reality. We wanted to address the question whether subjective judgment of a motif as artificial compared to judging it as naturalistic changes the way in which it is processed in the brain. During fMRI, photographs of real sceneries and artistic pictures matched for semantic content were presented for 80ms each. Participants were asked to assess all of these for degree of artificiality to study the parametric modulation of visual perception weighted by the subjective artificiality rating. Watching pictures, rated as being artificial, involved more strongly the bilateral anterior pole, precuneus, posterior cingulate cortex and posterior hippocampus, which suggests involvement of autobiographical memory networks (Pichon and Kell, 2013, JNeurosci, 33(4):1640-50). When pictures were rated as naturalistic a large bilateral action-related network was activated including the intraparietal sulcus, premotor cortices, the inferior frontal gyrus, and insula. Pictures judged as natural were retrospectively also labeled as more dynamic. Our data suggest that perception of naturalistic scenes engages action-related networks to a greater extent than artificial scenes possibly due to implicitly higher dynamics in the static images. |
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