Bertamini, M 
ORCID: 0000-0001-8617-6864, Rampone, G ORCID: 0000-0002-2710-688X, Oulton,, Jennifer, Tatlidil, Semir and Makin, Alexis DJ ORCID: 0000-0002-4490-7400
(2019)
Sustained response to symmetry in extrastriate areas after stimulus offset: An EEG study
Scientific Reports, 9 (1).
pp. 1-11.
ISSN 2045-2322, 2045-2322
Abstract
Electrophysiological (EEG) studies of human perception have found that amplitude at posterior electrodes is more negative for symmetrical patterns compared to asymmetrical patterns. This negativity lasts for hundreds of milliseconds and it has been called sustained posterior negativity (SPN). Symmetry activates a network of visual areas, including the lateral occipital complex (LOC). The SPN is a response to presence of symmetry in the image. Given the sustained nature of this activation, in this study we tested the persistence of the SPN after stimulus offset. Two shapes were presented (for 0.5 s each) with a 1 s blank interval in between. We observed a sustained response after stimulus offset, irrespective of whether the task required processing of shape information. This supports the idea that the response to symmetry is generated by information in the image, independently of task, and that it is sustained over approximately one second post stimulus onset.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Humans, Electroencephalography, Photic Stimulation, Neurophysiology, Spatial Processing |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 13 Mar 2019 14:03 |
| Last Modified: | 01 Mar 2026 02:54 |
| DOI: | 10.1038/s41598-019-40580-z |
| Open Access URL: | https://doi.org/10.1038/s41598-019-40580-z |
| Related Websites: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3034181 |
| Disclaimer: | The University of Liverpool is not responsible for content contained on other websites from links within repository metadata. Please contact us if you notice anything that appears incorrect or inappropriate. |
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