Electrophysiological responses to visuospatial regularity

Humans are quicker to detect reflectional than rotational or translational symmetry, despite the fact that these patterns are equally regular. We were interested in the neural correlates of these perceptual effects. Participants viewed random, reflection, rotation, and translation patterns while we...

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Bibliographic Details
Published in:Psychophysiology 2013-10, Vol.50 (10), p.1045-1055
Main Authors: Makin, Alexis D. J., Rampone, Giulia, Pecchinenda, Anna, Bertamini, Marco
Format: Article
Language:English
Subjects:
Adolescent
Adult
Cognition
EEG/ERP
Electroencephalography
Evoked Potentials - physiology
Eyes & eyesight
Female
Humans
Information processing
Male
Middle Aged
Normal volunteers
Pattern Recognition, Visual - physiology
Photic Stimulation
Physiological psychology
Sensation/Perception
Sensory perception
Young Adult
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Summary:Humans are quicker to detect reflectional than rotational or translational symmetry, despite the fact that these patterns are equally regular. We were interested in the neural correlates of these perceptual effects. Participants viewed random, reflection, rotation, and translation patterns while we recorded EEG from the scalp. Half the participants classified the pattern regularity overtly, the other half did not explicitly attend to pattern regularity but reported rare oddball trials, where two squares were embedded among the dots. The amplitude of a symmetry‐related ERP known as the sustained posterior negativity was most pronounced for reflection, then rotation and translation. We suggest that reflectional symmetry, despite its biological significance, may not be processed by unique visual mechanisms, but instead it could be a preferred stimulus for a more general regularity‐sensitive network in the extrastriate visual cortex.
ISSN:0048-5772
1469-8986
1540-5958
DOI:10.1111/psyp.12082