An FMRI investigation of the cortical network underlying detection and categorization abilities in hemianopic patients.

An FMRI investigation of the cortical network underlying detection and categorization abilities in hemianopic patients. Perez, C., Peyrin, C., Cavézian, C., Coubard, O., Caetta, F., Raz, N., Levin, N., Doucet, G., Andersson, F., Obadia, M., Gout, O., Héran, F., Savatovsky, J., & Chokron, S. Brain topography, 26(2):264--77, April, 2013.

Paper doi abstract bibtex

The current study aims to investigate visual scene perception and its neuro-anatomical correlates for stimuli presented in the central visual field of patients with homonymous hemianopia, and thereby to assess the effect of a right or a left occipital lesion on brain reorganization. Fourteen healthy participants, three left brain damaged (LBD) patients with right homonymous hemianopia and five right brain damaged (RBD) patients with left homonymous hemianopia performed a visual detection task (i.e. "Is there an image on the screen?") and a categorization task (i.e. "Is it an image of a highway or a city?") during a block-designed functional magnetic resonance imaging recording session. Cerebral activity analyses of the posterior areas-the occipital lobe in particular-highlighted bi-hemispheric activation during the detection task but more lateralized, left occipital lobe activation during the categorization task in healthy participants. Conversely, in patients, the same network of activity was observed in both tasks. However, LBD patients showed a predominant activation in their right hemisphere (occipital lobe and posterior temporal areas) whereas RBD patients showed a more bilateral activation (in the occipital lobes). Overall, our preliminary findings suggest a specific pattern of cerebral activation depending on the task instruction in healthy participants and cerebral reorganization of the posterior areas following brain injury in hemianopic patients which could depend upon the side of the occipital lesion.

@article{ Perez2013,
  abstract = {The current study aims to investigate visual scene perception and its neuro-anatomical correlates for stimuli presented in the central visual field of patients with homonymous hemianopia, and thereby to assess the effect of a right or a left occipital lesion on brain reorganization. Fourteen healthy participants, three left brain damaged (LBD) patients with right homonymous hemianopia and five right brain damaged (RBD) patients with left homonymous hemianopia performed a visual detection task (i.e. "Is there an image on the screen?") and a categorization task (i.e. "Is it an image of a highway or a city?") during a block-designed functional magnetic resonance imaging recording session. Cerebral activity analyses of the posterior areas-the occipital lobe in particular-highlighted bi-hemispheric activation during the detection task but more lateralized, left occipital lobe activation during the categorization task in healthy participants. Conversely, in patients, the same network of activity was observed in both tasks. However, LBD patients showed a predominant activation in their right hemisphere (occipital lobe and posterior temporal areas) whereas RBD patients showed a more bilateral activation (in the occipital lobes). Overall, our preliminary findings suggest a specific pattern of cerebral activation depending on the task instruction in healthy participants and cerebral reorganization of the posterior areas following brain injury in hemianopic patients which could depend upon the side of the occipital lesion.},
  author = {Perez, Céline and Peyrin, Carole and Cavézian, Céline and Coubard, Olivier and Caetta, Florent and Raz, Noa and Levin, Netta and Doucet, Gä{e}lle and Andersson, Frédéric and Obadia, Michä{e}l and Gout, Olivier and Héran, Fraņ{c}oise and Savatovsky, Julien and Chokron, Sylvie},
  doi = {10.1007/s10548-012-0244-z},
  file = {:C$\backslash$:/Users/emnicolas/AppData/Local/Mendeley Ltd./Mendeley Desktop/Downloaded/Perez et al. - 2013 - An FMRI investigation of the cortical network underlying detection and categorization abilities in hemianopic pati.pdf:pdf},
  issn = {1573-6792},
  journal = {Brain topography},
  keywords = {Adult,Aged,Brain Ischemia,Brain Ischemia: complications,Brain Mapping,Case-Control Studies,Cerebral Cortex,Cerebral Cortex: pathology,Cerebral Cortex: physiology,Cerebral Hemorrhage,Cerebral Hemorrhage: complications,Functional Laterality,Functional Laterality: physiology,Hemianopsia,Hemianopsia: etiology,Hemianopsia: pathology,Hemianopsia: physiopathology,Humans,Magnetic Resonance Imaging,Male,Middle Aged,Occipital Lobe,Occipital Lobe: anatomy \& histology,Occipital Lobe: physiology,Vision, Ocular,Vision, Ocular: physiology,Visual Fields,Visual Fields: physiology,Visual Perception,Visual Perception: physiology},
  month = {April},
  number = {2},
  pages = {264--77},
  pmid = {22878845},
  title = {{An FMRI investigation of the cortical network underlying detection and categorization abilities in hemianopic patients.}},
  url = {http://www.ncbi.nlm.nih.gov/pubmed/22878845},
  volume = {26},
  year = {2013}
}

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