Abstract
We examined the relations between texture segregation and contour integration in patients with deficits in spatial attention leading to left or right hemisphere extinction. Patients and control participants were presented with texture and contour stimuli consisting of oriented elements. We induced regularity in the stimuli by manipulating the element orientations resulting in an implicit texture border or explicit contour. Participants had to discriminate curved from straight shapes without making eye movements, while the stimulus presentation time was varied using a QUEST procedure. The results showed that only patients with right hemisphere extinction had a spatial bias, needing a longer presentation time to determine the shape of the border or contour on the contralesional side, especially for borders defined by texture. These results indicate that texture segregation is modulated by attention-related brain areas in the right posterior parietal cortex.
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Notes
Patient JB and RH found it difficult to stay within a window of 1.5° around the fixation cross, especially when presented with Gabor stimuli. In order to avoid too many aborted trials and to allow them to complete the experiment, for them no restrictions were made on the initial fixation position.
The linear regression analysis showed no significant effect of eye movements on performance when subjects were required to fixate (t(82) = 1.06, p = 0.29).
Analyses were performed with and without including the data from subjects RH and JB, who could freely look at the entire display. Including their data did not change our conclusions. Here, results for all participants are reported.
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Acknowledgments
This work was supported by the Methusalem program by the Flemish Government (METH/08/02) awarded to Johan Wagemans and by travel grants of Academische Stichting Leuven and Fund for Scientific Research (FWO-Vlaanderen) awarded to Kathleen Vancleef. In addition, support was provided by the Stroke Association and the National Institute of Health Research (UK). We would like to thank Karen Lefever and Lien Peters for assistance in data collection, the patients for their kind participation and two reviewers for their helpful comments.
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Vancleef, K., Wagemans, J. & Humphreys, G.W. Impaired texture segregation but spared contour integration following damage to right posterior parietal cortex. Exp Brain Res 230, 41–57 (2013). https://doi.org/10.1007/s00221-013-3629-7
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DOI: https://doi.org/10.1007/s00221-013-3629-7