| 1. |
- Makin, Alexis D J, et al.
(author)
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Coherent illusory contours reduce microsaccade frequency.
- 2011
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In: Neuropsychologia. - : Elsevier BV. - 1873-3514 .- 0028-3932. ; 49:9, s. 2798-801
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Journal article (peer-reviewed)abstract
- Synchronized high-frequency gamma band oscillations (30-100 Hz) are thought to mediate the binding of single visual features into whole-object representations. For example, induced gamma band oscillations (iGBRs) have been recorded ∼ 280 ms after the onset of a coherent Kanizsa triangle, but not after an incoherent equivalent shape. However, several recent studies have provided evidence that the EEG-recorded iGBR may be a by-product of small saccadic eye movements (microsaccades). Considering these two previous findings, one would hypothesis that there should be more microsaccades following the onset of a coherent Kanizsa triangle. However, we found that microsaccade rebound rate was significantly higher after an incoherent triangle was presented. This result suggests that microsaccades are not a reliable indicator of perceptual binding, and, more importantly, implies that iGBR cannot be universally produced by ocular artefacts.
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| 2. |
- Makin, A. D. J., et al.
(author)
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Covert Tracking: A Combined ERP and Fixational Eye Movement Study
- 2012
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In: Plos One. - : Public Library of Science (PLoS). - 1932-6203. ; 7:6
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Journal article (peer-reviewed)abstract
- Attention can be directed to particular spatial locations, or to objects that appear at anticipated points in time. While most work has focused on spatial or temporal attention in isolation, we investigated covert tracking of smoothly moving objects, which requires continuous coordination of both. We tested two propositions about the neural and cognitive basis of this operation: first that covert tracking is a right hemisphere function, and second that pre-motor components of the oculomotor system are responsible for driving covert spatial attention during tracking. We simultaneously recorded event related potentials (ERPs) and eye position while participants covertly tracked dots that moved leftward or rightward at 12 or 20 degrees/s. ERPs were sensitive to the direction of target motion. Topographic development in the leftward motion was a mirror image of the rightward motion, suggesting that both hemispheres contribute equally to covert tracking. Small shifts in eye position were also lateralized according to the direction of target motion, implying covert activation of the oculomotor system. The data addresses two outstanding questions about the nature of visuospatial tracking. First, covert tracking is reliant upon a symmetrical frontoparietal attentional system, rather than being right lateralized. Second, this same system controls both pursuit eye movements and covert tracking.
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| 3. |
- Svensson, J, et al.
(author)
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Gallstone disease in children
- 2012
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In: Seminars in pediatric surgery. - : Elsevier BV. - 1532-9453 .- 1055-8586. ; 21:3, s. 255-265
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Journal article (peer-reviewed)
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