Cortical oscillatory activity associated with the perception of illusory and real visual contours

We used magnetoencephalography (MEG) to examine the nature of oscillatory brain rhythms when passively viewing both illusory and real visual contours. Three stimuli were employed: a Kanizsa triangle; a Kanizsa triangle with a real triangular contour superimposed; and a control figure in which the co...

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Veröffentlicht in:International journal of psychophysiology 2009-09, Vol.73 (3), p.265-272
Hauptverfasser: Kinsey, K., Anderson, S.J., Hadjipapas, A., Nevado, A., Hillebrand, A., Holliday, I.E.
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container_issue 3
container_start_page 265
container_title International journal of psychophysiology
container_volume 73
creator Kinsey, K.
Anderson, S.J.
Hadjipapas, A.
Nevado, A.
Hillebrand, A.
Holliday, I.E.
description We used magnetoencephalography (MEG) to examine the nature of oscillatory brain rhythms when passively viewing both illusory and real visual contours. Three stimuli were employed: a Kanizsa triangle; a Kanizsa triangle with a real triangular contour superimposed; and a control figure in which the corner elements used to form the Kanizsa triangle were rotated to negate the formation of illusory contours. The MEG data were analysed using synthetic aperture magnetometry (SAM) to enable the spatial localisation of task-related oscillatory power changes within specific frequency bands, and the time-course of activity within given locations-of-interest was determined by calculating time-frequency plots using a Morlet wavelet transform. In contrast to earlier studies, we did not find increases in gamma activity (>30 Hz) to illusory shapes, but instead a decrease in 10–30 Hz activity approximately 200 ms after stimulus presentation. The reduction in oscillatory activity was primarily evident within extrastriate areas, including the lateral occipital complex (LOC). Importantly, this same pattern of results was evident for each stimulus type. Our results further highlight the importance of the LOC and a network of posterior brain regions in processing visual contours, be they illusory or real in nature. The similarity of the results for both real and illusory contours, however, leads us to conclude that the broadband (
doi_str_mv 10.1016/j.ijpsycho.2009.04.004
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ispartof International journal of psychophysiology, 2009-09, Vol.73 (3), p.265-272
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subjects Adult
Attention
Behavioral psychophysiology
Biological and medical sciences
Biological Clocks - physiology
Biophysics
Brain Mapping
Evoked Potentials, Visual - physiology
Female
Form Perception - physiology
Fundamental and applied biological sciences. Psychology
Gamma
Humans
Illusions - physiology
Illusory-contours
Magnetoencephalography
Male
MEG
Middle Aged
Object-recognition
Photic Stimulation - methods
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
SAM
Time Factors
Vision
Visual Cortex - physiology
title Cortical oscillatory activity associated with the perception of illusory and real visual contours
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