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The Contribution of human brain areas to visual illusory effects: an fMRI-study on the illusory motion effect in the Pinna - Brelstaff figure

Budnik, Ursula and Bayerl, Pierre and Attar, Catherine Hindi and Pinna, Baingio and Hennig, Jürgen and Speck, Oliver (2006) The Contribution of human brain areas to visual illusory effects: an fMRI-study on the illusory motion effect in the Pinna - Brelstaff figure. Perception, Vol. 35 (Suppl.), p. 43. eISSN 1468-4233. Article.

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Abstract

In the Pinna - Brelstaff figure (PBF) an illusion of counter-rotating motion in two circles occurs when static patterns with specific luminance gradients are moved across the peripheral visual field during observer's self-movement towards or away from the figure. To create an illusion suitable for the MR scanner, computerised animation generated contraction and expansion of concentric circles of the PBF patterns on a screen. The visual illusory effect was quantified in each participant by nulling the illusory rotation effect in the PBF with counter-rotating motion. From these motion parameters correctly perceived rotating figures and a subjectively non-rotating PBF were created as a control individually for each subject. Sixteen volunteers with normal vision were tested at 3 T. A block design with randomised presentation order and full brain coverage EPI (1.7 mm × 1.7 mm × 3 mm resolution) was used. Both the illusory and the true rotation evoked increased activation within the motion-specific complex hMT+. The frontal eye fields and the Brocca homologue were found to be related to illusory rotation perception. When the real-stimulus-driven correct perception was compared with the illusory effect perception activations were found in the early visual areas, V1/V2.

Item Type:Article
ID Code:2947
Status:Published
Refereed:Yes
Uncontrolled Keywords:Visual illusory effect, Brelstaff figure
Subjects:Area 11 - Scienze storiche, filosofiche, pedagogiche e psicologiche > M-PSI/01 Psicologia generale
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze dei linguaggi
Publisher:Pion
eISSN:1468-4233
Additional Information:Abstract from the ECVP 2006: 29. European Conference on Visual Perception, St. Petersburg, Russia, 20-25 August 2006.
Deposited On:09 Sep 2009 13:16

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